Choosing the wrong fabric is the most expensive mistake in garment development — and the most avoidable. This guide walks you through every decision, from identifying your garment's primary function to selecting the exact fiber, GSM, finish, and construction that matches your project's specific requirements. For background on the broader fabric universe, see our complete fabric guides hub and the spandex fabric guide.
The Five Questions That Determine Every Fabric Choice
Every fabric selection decision — whether for swimwear, yoga pants, competition costumes, or team jerseys — comes down to answering the same five questions in the same order. These questions build on each other: the answer to each one narrows the options for the next, until the correct fabric for your specific project becomes clear.
Fabric selection problems almost always trace back to skipping one of these questions or answering them in the wrong order — choosing a fabric because it looks right before confirming it performs right, or choosing by price before confirming it meets the functional requirements. Work through these questions systematically and the correct fabric choice becomes obvious rather than overwhelming.
What is this garment for?
The end use — swimwear, activewear, dance, costume, casual — determines every other variable. This question comes first, always.
What performance does it need?
Chlorine resistance, moisture-wicking, compression, breathability, stage lighting performance — identify the non-negotiable performance requirements before anything else.
What fiber type serves those needs?
Nylon or polyester? High spandex or low? Natural blend or pure synthetic? The fiber choice flows directly from the performance requirements defined in question two.
What GSM and construction?
How heavy? How opaque? How structured? GSM and knit construction define the physical performance of the fabric — opacity, compression force, warmth, and drape.
What finish and additional needs?
Matte, shiny, foil, holographic, printed, brushed? Does the garment need sublimation printing compatibility, embellishment capability, or special care requirements? See the fabric finishes guide for the full breakdown.
The order matters: Designers who start with question five (finish / aesthetics) and work backward consistently end up with garments that look right but don't perform correctly. Designers who start with question one (end use) and work forward consistently end up with garments that perform and look right. Function before form — always.
Decision Tool
Fabric Decision Tree — Find Your Starting Point
Work through each question in sequence. Your answers will direct you to the fabric selector section below where your specific garment type is covered in full detail. If you'd rather speak to a person, our expert help & advice page connects you with our fabric specialists.
Q1 — Will this garment be used in or around water?
Chlorine resistance and shape retention in water are the priorities. Nylon leads polyester for pool performance.
Either works. Nylon for premium feel; polyester if sublimation printing is needed.
Water performance is not a primary driver. Move to the next question.
Q2 — Is this a high-intensity performance garment?
Dance, gymnastics, figure skating — choose nylon spandex with 18–25% elastane for maximum four-way stretch and recovery.
Running, HIIT, team sport — polyester excels at wicking, UV resistance, and sublimation printing.
Standard or moderate performance requirements. Continue to refine.
Q3 — Is visual impact under stage or competition lighting a priority?
Competition costumes, stagewear, skating dresses — foil and holographic finishes dominate under directional lighting.
Ballroom, Latin, theatrical — velvet pile creates dimensional depth and warmth under stage lighting that flat fabrics cannot match.
Stage lighting performance is not the primary driver. Move on.
Q4 — Does this garment require sublimation or all-over printing?
Non-negotiable. Sublimation inks bond with polyester fibers — no other fiber produces comparable results. See the printed spandex fabric guide for details.
Printing method is not a constraint. Continue.
Q5 — Is sustainability positioning important to your brand?
Identical performance to virgin polyester, available as rPET from recycled bottles or recycled nylon (ECONYL®-style).
Standard virgin fiber options. Go to the detailed selector for your garment type.
Project Selectors
Fabric Selector by Garment Type — Complete Recommendations
Each selector below covers a specific garment category with the complete recommended fabric specification — fiber type, GSM range, construction, finish, and printing compatibility. Use the decision tree above to identify your garment type, then find the matching selector. Browsing by aesthetic instead? Jump straight to floral prints, abstract prints, geometric prints, animal prints, or solid colors.
Swimwear — Competitive & Recreational
Swimwear has the most specific and non-negotiable performance requirements of any garment category. The primary driver is chlorine resistance — the ability to survive repeated pool exposure without losing stretch, colour, or shape. Nylon spandex leads every other fiber for pool swimwear because its fiber chemistry resists chlorine oxidation significantly better than polyester. The secondary driver is shape retention when wet — the fabric must recover fully to its original dimensions after being stretched while saturated.
Critical test before cutting: Opacity when wet and stretched. Soak your swatch, stretch 50% across a white background, and check under natural light. A fabric that passes the flat dry test can still fail in a wet swimsuit. Non-negotiable for any swimwear project.
Read the full Swimwear Fabric Guide →Yoga, Pilates & Studio Wear
Yoga and studio wear lives at the intersection of performance and aesthetics. The garment must be squat-proof — no exceptions — while being soft enough for all-day wear and flattering enough to wear outside the studio. Nylon spandex at medium-to-heavy GSM is the industry standard because it delivers all three: opacity, softness, and excellent shape retention through deep squats and extended sessions. Squat-proof testing is mandatory before production.
Non-negotiable test: Squat test at 50% stretch against a white background under bright light. Add 10–15 GSM for white and light colours — they require more density for equivalent opacity to dark shades.
Read the full Activewear Fabric Guide →Gym Wear, HIIT & High-Intensity Training
High-intensity gym wear prioritises moisture management, durability under friction (gym equipment, floor surfaces), and consistent fit through intense sessions. Nylon spandex leads for premium gym wear because its abrasion resistance significantly outlasts polyester on high-friction garments like shorts, bra bands, and legging gussets. Polyester spandex is the correct choice when sublimation printing is required or cost efficiency is the priority. Both are excellent — the choice depends on budget and print requirements.
Design note: For high-intensity garments above 210 GSM, plan ventilation panels in the mesh — the breathability trade-off at higher weights becomes a comfort issue during intense training without active airflow zones.
Read the full Activewear Fabric Guide →Running, Cycling & Endurance Sports
Running and endurance sports demand lighter-weight fabrics for minimal thermal load and maximum breathability, strong UV resistance for outdoor exposure, and excellent quick-dry performance. Polyester spandex has a slight edge over nylon for outdoor running because of its marginally better UV resistance and lower price per metre for high-volume production. Nylon is the preferred choice for cycling shorts and bib shorts where abrasion resistance at the saddle contact point is a high-priority requirement. For golf and country club apparel, lightweight polyester spandex with UV resistance is the established standard.
Weight note: For running specifically, go as light as opacity and structural requirements allow. Every gram of fabric weight adds to the thermal and physical load over long distances. Prioritise breathability over compression for anything above 10km distance.
Read the full Activewear Fabric Guide →Dancewear, Gymnastics & Figure Skating
Dancewear splits into two distinct contexts with different fabric requirements: class and rehearsal wear (prioritises comfort, stretch, durability, easy care) and competition and performance wear (prioritises visual impact under stage lighting, decoration capability, and extreme stretch). Most dance wardrobes need both. Nylon spandex is the base for almost all dancewear — the fiber type for specialty performance fabrics (foil, holographic, velvet) depends on the specific finish required. For festival and rave performance, the same fabrics carry over with even more focus on metallic and holographic finishes.
Embellishment planning: Decide on your crystal and embellishment method before ordering fabric. Hot-fix crystals require heat-compatible fabrics. Cold-fix adhesive is required for foil, holographic, and velvet surfaces. See the Fabric Finishes Guide for detailed compatibility.
Read the full Dancewear Fabric Guide →Compression, Recovery & Base Layers
Compression garments require a specific combination of high spandex content (for elastic force) and high GSM (for structural density). The compression force comes from the ratio of the garment's cut dimensions to the body dimensions it covers — the fabric's stretch resistance provides the pressure. This means pattern engineering is as important as fabric selection: a compression fabric cut with insufficient negative ease will produce no meaningful compression regardless of how "compression" the spec sheet describes it. Solid spandex in black, navy/blue, or red dominates this category.
Important: True compression garments require graduated compression measurement (mmHg) testing to make medical-adjacent claims. Fabric GSM and spandex % establish the material's compression capacity; pattern and grading determine the actual compression delivered to the body.
Read the GSM & Fabric Weight Guide →Winter Activewear & Cold-Weather Training
Cold-weather activewear requires fabrics that add thermal insulation without sacrificing the stretch and moisture management that performance training demands. Brushed nylon spandex is the industry standard — its smooth outer face maintains the clean appearance of standard activewear while the mechanically raised inner pile creates warmth through trapped air insulation. For the warmest builds, spandex fleece (Pro Stretch) adds a thicker fleece pile for genuine outdoor-cold conditions. The outer face can be sublimation-printed on polyester brushed fabrics; nylon brushed fabrics are not sublimation compatible but offer superior softness.
Trade-off to manage: Higher GSM brushed fabrics are warmer but significantly less breathable. For high-intensity cold-weather training, plan ventilation panels — a brushed body with mesh underarm and back panels balances warmth and breathability effectively.
Read the GSM & Fabric Weight Guide →Performance Costumes & Theatrical Stagewear
Performance costumes are the most design-intensive garment category — they typically combine multiple fabric types, finishes, and embellishment techniques in a single garment. The selection process is different here: start with the lighting environment and the visual effect you need to achieve, then work backward to the fabrics that produce it. No other garment category allows this much creative latitude in fabric selection — and no other category punishes uninformed selection as visibly. For inspiration, browse festival-wear fabrics and metallic spandex together.
Embellishment rule: Plan crystal and rhinestone application before you order any fabric. Your embellishment method determines which fabric surfaces are compatible — hot-fix, cold-fix, and sewn-on techniques each have different fabric requirements. See the Fabric Finishes Guide for full compatibility details.
Read the full Fabric Finishes Guide →Custom & Team Apparel
Custom and team apparel is almost always centred on sublimation printing — which means the fabric selection decision is largely made for you: sublimation polyester spandex tricot is the substrate. The variables within that choice are GSM (matched to the garment type and activity), construction (smooth face for print clarity), and whether to use virgin or recycled polyester (rPET adds sustainability credentials with no performance trade-off). Colour consistency across a volume order is critical — always specify the exact fabric code and request colour-matched production samples before committing to a full run.
Production note: For sublimation printing, always sew test prints before full production. Temperature calibration varies by machine and substrate — a print that looks perfect on a swatch from one batch can shift colour on a different fabric roll of nominally the same specification. Test prints are not optional for professional production.
Read the Nylon Spandex Guide →Master Comparison
Fabric Type Master Matrix — Every Property at a Glance
Use this matrix as a quick reference when comparing fabric options across multiple properties simultaneously. Ratings are relative within the category of performance stretch fabrics.
| Fabric Type | Chlorine Resist. | Softness | Abrasion Resist. | Moisture Wick | UV Resist. | Sublimation | Stage Impact | Price |
|---|---|---|---|---|---|---|---|---|
| Nylon Spandex | ⭐⭐⭐⭐⭐ Best | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | ✗ (special ink) | ⭐⭐⭐ | Moderate |
| Polyester Spandex | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ Best | ⭐⭐⭐⭐⭐ Best | ✓ Best | ⭐⭐⭐ | Low–Mod |
| Recycled Poly (rPET) | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ✓ Best | ⭐⭐⭐ | Moderate |
| Foil Spandex | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐ | ⭐⭐ | ✗ | ⭐⭐⭐⭐⭐ Best | Moderate |
| Holographic Spandex | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐ | ⭐⭐ | ✗ | ⭐⭐⭐⭐⭐ Best | Moderate |
| Stretch Velvet | ⭐⭐ | ⭐⭐⭐⭐⭐ Best | ⭐⭐ | ⭐ | ⭐⭐ | ✗ | ⭐⭐⭐⭐ | Moderate |
| Brushed Nylon Spandex | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ Best (inner) | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ✗ | ⭐⭐ | Moderate |
| Power Mesh | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ Best | ⭐⭐⭐ | ✗ | ⭐ (panels only) | Low |
| Compression Fabric | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ✓ (poly base) | ⭐⭐ | Moderate |
What to Avoid
The Most Common Fabric Selection Mistakes — and How to Avoid Them
Choosing by appearance, not performance
Selecting a fabric because it looks right in a product photo or feels nice on a flat swatch — without testing stretch, opacity under load, and wet behaviour. The most common cause of garment returns and production restarts.
Trusting GSM numbers without testing
Assuming that a stated GSM number guarantees a specific opacity level. Supplier GSM tolerances of ±10–15 GSM are standard, and colour, fiber type, and construction all affect opacity independently of GSM. A fabric that should be 220 GSM may measure 205 — and fail the squat test.
Choosing polyester when nylon is needed
Using polyester spandex for swimwear or premium activewear where chlorine resistance and soft hand feel are the primary requirements — because polyester is cheaper. The customer experience difference is immediately noticeable, and swimwear in particular degrades much faster in chlorinated pools.
Trying to sublimation print on nylon
Ordering nylon spandex for a sublimation-printed project and discovering — after the print run — that the inks don't bond correctly to nylon and produce washed-out, poorly saturated results. A very common and very expensive mistake for first-time custom apparel producers.
Not testing opacity when wet
Testing swimwear fabric opacity flat and dry — and then discovering the garment becomes transparent when wet in the pool. A fundamental testing omission that produces the most embarrassing and commercially damaging product failures in swimwear.
Ordering foil fabric without testing embellishment
Ordering foil or holographic fabric for competition costumes and applying hot-fix crystals — then discovering the heat tool has permanently damaged and delaminated the foil surface. Foil requires cold-fix adhesive only. This error is irreversible.
Testing Before You Buy
How to Test Fabric Swatches — The Complete Pre-Production Checklist
Ordering swatches and testing them correctly before committing to production volume is the single most effective risk-reduction step in garment development. Here is the systematic swatch testing process used by professional activewear and dancewear manufacturers. For deeper construction techniques, see the how to sew stretch fabric guide.
Order a minimum 30cm × 30cm swatch of your actual fabric
Product photos and colour swatches on a website tell you nothing about how the fabric actually behaves. A 30cm × 30cm swatch gives you enough material to run all the tests below. If you're considering multiple colourways, order a swatch in each — opacity and colour behaviour vary between shades even in the same fabric. Browse new arrivals to see what's freshly in stock.
Measure actual stretch percentage
Mark a 10cm segment on the swatch with chalk. Stretch it to its maximum comfortable extension and measure. Divide the extended measurement by 10 and subtract 1 to get the stretch percentage. Compare to your pattern's stretch requirement — if they don't match, the fit will be wrong regardless of how well everything else is executed.
Test opacity at 50% stretch — dry
Place the swatch on a white sheet of paper. Stretch it to 50% (150% of its resting width) across the white background under a bright light source. If the white shows through, the fabric will not be opaque in a legging at the hip or knee during use. For dark colours, check carefully. For light and white colours, scrutinise — they need higher GSM to achieve equivalent opacity.
Test opacity wet and stretched (swimwear only)
Soak the swatch for 30 seconds in cold water. While wet, stretch to 50% against a white background and check under natural light. Water fills the air pockets in the knit and significantly reduces opacity. If it fails this test, it fails as swimwear — regardless of its dry performance.
Test elastic recovery after maximum stretch
Stretch the swatch to its maximum extent in both directions and hold for 30 seconds. Release and observe how completely and quickly it returns to its original dimensions. Incomplete recovery (the swatch stays slightly larger than its original size) indicates poor elastane content or quality. Recovery should be near-instant and near-complete in a quality performance fabric.
Measure GSM (weight)
Cut a precise 10cm × 10cm square. Weigh on a kitchen scale in grams. Multiply by 100 to get GSM. Compare to the supplier's stated GSM — if it's more than 10 GSM below specification, you need to discuss this with your supplier or source elsewhere. See the GSM & Fabric Weight Guide for the full measuring process.
Test embellishment compatibility (specialty fabrics)
For foil, holographic, velvet, or any surface you plan to embellish: test your exact embellishment method on the swatch before ordering volume. Apply a hot-fix crystal at your planned temperature setting. Test cold-fix adhesive cure time and bond strength. Attempt to press at your intended seam pressing temperature. Surface damage discovered in testing costs nothing; surface damage discovered on a finished costume is irreversible.
Sew a test seam on double-layer swatch
Before cutting a garment, sew a test seam on a folded swatch with the needle, stitch type, and settings you plan to use. Pull the seam hard in both directions. A correct stitch-fabric combination extends and recovers without breaking or popping stitches. If the seam fails, adjust needle size, stitch type, or tension before cutting your fabric. See the Sewing Stretch Fabric Guide for full stitch and needle guidance.
The swatch test is not optional for new fabrics. Every professional activewear, swimwear, and dancewear manufacturer tests swatches before production. The cost of a swatch and one hour of testing is nothing compared to the cost of cutting an entire production run in a fabric that fails the squat test or the wet opacity test. Use our Fabric Yardage Estimator once your fabric is confirmed to calculate exactly how much you need.
Quick Reference
Fabric Selection Quick Reference — 20 Common Projects
Hot Yoga Leggings
185–200 GSM · breathability priority
Running Tights
165–195 GSM · lightweight priority
Cycling Shorts
210–250 GSM · abrasion at saddle
Ballroom Costume
Multi-fabric construction on nylon base
Eco Activewear
Same spec as virgin poly · sustainability credentials
Complete Fabric Guide Series — All 10 Guides
FAQ
How to Choose Fabric — Frequently Asked Questions
What is the best fabric for making activewear?
The best fabric for activewear depends on the specific garment and activity. Nylon spandex is the premium choice for yoga wear, cycling, swimming, and dancewear — it offers the softest hand feel, best abrasion resistance, and superior chlorine resistance. Polyester spandex is the best choice for sublimation-printed activewear, running gear, and any application where UV resistance and cost efficiency are priorities. For cold-weather training, brushed nylon spandex adds warmth without sacrificing stretch. For high-compression garments, a dedicated compression-weight nylon or polyester spandex at 230–270 GSM is appropriate. Match the fiber type and GSM to the specific garment's primary performance requirement — there is no single universally "best" activewear fabric.
Nylon spandex vs polyester spandex — which should I choose?
Choose nylon spandex when: the garment will be used in chlorinated water, you need the softest possible hand feel against skin, abrasion resistance is critical (cycling shorts, yoga leggings, swimwear), or you want the richest, deepest colour without printing. Choose polyester spandex when: sublimation printing is required (polyester is the only fiber that works correctly with standard sublimation inks), UV resistance for outdoor use is important, you need recycled/eco fabric credentials (rPET is widely available in polyester), or cost efficiency is a priority for high-volume production. Both are excellent performance fabrics — the choice is driven by use case, not quality level.
What fabric should I use for a competition leotard or gymnastics costume?
A competition leotard or gymnastics costume typically uses a combination of fabric types. The structural base is a high-stretch nylon spandex (80/20 or 75/25 ratio) at 165–190 GSM — lower GSM allows more stretch freedom for extreme ranges of motion. The visual impact panels use foil spandex, holographic spandex, or a combination of both — these create the intense light-catching effect that reads well under competition arena lighting. Power mesh in nude tones creates the skin-illusion effect at necklines, shoulders, and arms. Crystals and rhinestones are applied using cold-fix adhesive on foil/holographic surfaces and hot-fix on nylon spandex panels. See the Dancewear Fabric Guide for the complete discipline-by-discipline breakdown.
How do I know what GSM to choose?
GSM selection comes down to three factors: what the garment is for, what opacity is needed, and what GSM your pattern is designed for. For yoga and gym leggings, 200–225 GSM is the standard range — enough for opacity and compression, not so heavy as to be stifling. For swimwear, 165–210 GSM depending on whether it's competitive or recreational. For compression garments, 230–270 GSM. For dancewear, 165–200 GSM for maximum stretch. The key test is always physical: order a swatch in your intended colour and test opacity at 50% stretch. Lighter colours need higher GSM for equivalent opacity to dark shades. See the GSM & Fabric Weight Guide for a complete breakdown.
Can I use the same fabric for swimwear and activewear?
Yes — nylon spandex at an appropriate GSM works well for both swimwear and activewear. A 190–205 GSM nylon spandex can serve as swimwear (check opacity when wet) and as gym or yoga leggings (check opacity at 50% stretch dry). The fabric requirements overlap significantly: both need four-way stretch, good recovery, durability, and moisture management. The main difference is chlorine resistance priority for swimwear — choose a fabric specifically rated for chlorine resistance if pool use is regular. A fabric suitable for frequent pool use will also work well as activewear; the reverse is not always true.
How much fabric do I need for my project?
Fabric yardage depends on your pattern pieces, the fabric width, and how efficiently the pieces can be nested. As a general reference: a standard pair of leggings requires approximately 1.2–1.5 metres of 150cm-wide fabric. A one-piece swimsuit requires approximately 1.0–1.3 metres. A sports bra requires approximately 0.5–0.8 metres for the body plus separate lining. A leotard requires approximately 0.8–1.2 metres. These are estimates — actual yardage depends on your specific pattern, size range, and the fabric's usable width after selvedge allowance. Use our Fabric Yardage Estimator to calculate precise yardage based on your actual pattern pieces. For shipping and order questions, see our FAQ on fabric, shipping & orders.
Where do I start if I've never chosen performance fabric before?
Start by answering the five questions in this guide in order: What is the garment for? What performance does it need? What fiber type serves those needs? What GSM? What finish? Once you have those answers, use the project selectors above to get a specific starting specification. Then order swatches and test them physically — opacity, stretch, recovery, and wet behaviour for swimwear. Sew a test seam before cutting. The guides in our complete fabric guide series cover every aspect of this in detail — from understanding stretch percentages and GSM to sewing techniques and long-term care. Still unsure? Talk to our fabric experts — we'll match a fabric to your project.
