Finding the perfect swimwear fabric by the yard can make all the difference in creating stylish and functional DIY swimsuits. Whether you're sewing a bikini or a one-piece, the right material not only enhances your design but also ensures comfort and durability in the water. For a broader foundation on swimwear fabric properties before diving in, explore our swimwear fabric guide or browse our full fabric guides hub.
New DIY enthusiasts often wonder where to source quality swim fabrics in small quantities. It can be challenging to find fabric shops that sell swimwear material without high minimum orders, especially if you only need 1–5 yards for a project. Fortunately, a variety of online retailers cater to hobbyist sewing swimwear needs, offering everything from nylon/spandex blends to polyester knits designed for swimwear.
Calculating Yardage for Bikinis vs. One-Pieces
One of the first questions when planning a swimsuit project is how much fabric you need. Bikinis generally require significantly less fabric than one-piece swimsuits. Most standard swimsuit patterns call for less than a yard of fabric; typically 0.5 to 0.75 yards of swimwear fabric is enough for a classic bikini set. This is because bikinis consist of smaller pattern pieces – a top and bottom – that use minimal yardage. By contrast, one-piece swimsuits have more coverage and larger pattern pieces, so you'll usually need closer to a full yard of fabric. A basic one-piece swimsuit pattern often requires about 1 yard of 60″-wide swimwear fabric for the main exterior, and an equal amount for the lining.
It's common practice to line swimwear for modesty and support; many patterns note that you'll need the same amount of lining as your outer fabric for a fully lined suit. Most swimwear knits are 58–60 inches wide, which affects how your pattern pieces lay out. Always consult your specific sewing pattern's recommendations. Our how to choose fabric guide covers what to evaluate when a physical swatch arrives, including stretch testing, opacity testing, and print placement assessment.
It's wise to buy a little extra fabric beyond the minimum requirement – this provides a margin for error in case of mistakes or to account for print placement (ensuring a pattern is centered or mirrored nicely on your pieces). For instance, if a bikini pattern in your size calls for 0.5 yards, you might purchase 0.75 yards to be safe; for a one-piece that needs 1 yard, getting 1.25 yards can allow for test swatches or adjustments. And don't forget to get enough swimwear lining (often a lightweight nude or matching fabric) – generally the same yardage as the main fabric – so your finished swimsuit has the proper backing and opacity. Our swimwear fabric guide covers lining fabric options and how to integrate them for all common swimwear applications.
Tips for Buying Printed vs. Solid Fabrics
When shopping for swimwear fabric by the yard, you'll notice an array of bold prints and solid colors. Each has its own considerations to keep in mind.
Pattern Placement and Aesthetics: Printed fabrics can make a swimsuit really stand out, but pay attention to the print's scale and placement. If you choose a large-scale print, a small bikini might only show a portion of the design. You may need to position your pattern pieces carefully so that the motifs land in flattering spots on the body. Solids, on the other hand, are straightforward – there's no pattern to match – which can make layout and cutting easier. Many swimwear designers pair a busy print with a coordinating solid (e.g. printed top and solid bottoms) for a balanced look.
Fabric Underside and Opacity: Many printed swim fabrics are produced by printing the design on a white base fabric. As a result, the underside of a printed fabric is often plain white. If the fabric stretches a lot on the body, you might see the base color faintly showing through, which can make the print look slightly faded when worn at full stretch. In contrast, solid-dyed fabrics are usually the same color on both sides, so they don't have a contrast underside. Our fabric weight guide covers how GSM affects opacity, compression, and durability across all common swimwear fabric constructions – a heavier GSM can help prevent grin-through on printed fabrics.
Colorfastness and Durability: Because swimwear is exposed to sun, chlorine, saltwater, and stretching, the quality of the print or dye matters. Lower-quality prints might crack, peel, or fade after exposure to pool chlorine or multiple wash cycles. High-quality swimwear prints (for example, those created with sublimation printing on polyester blends) are very colorfast and integrate into the fabric, preventing fading or peeling. Our sublimation page covers how sublimation printing bonds dye into polyester-spandex fibers to achieve permanent, saturated color that won't crack or fade with wear.
When evaluating printed fabric, make sure it can stretch and recover without blurring the design. Many online listings will mention the percentage of stretch and whether the fabric has four-way stretch (which is ideal for swimwear). Our stretch fabric types page covers the step-by-step stretch and recovery testing methodology in detail, including how to calculate stretch percentage from a home swatch test.
In summary, printed fabrics offer exciting design possibilities but require a bit more attention to detail when purchasing (regarding print durability, scale, and placement). Solid fabrics are versatile and often easier to work with for beginners. Depending on your project, you might even use both – for example, a solid contrast band or lining with a printed exterior.
Essential Notions: Thread and Elastic
High-quality thread and appropriate elastic are essential notions for sewing swimwear. Because swimsuits endure a lot of stress (stretching, water, sun, and frequent washing), using the right thread and elastic will ensure your DIY swimwear lasts and performs well. Our how to sew stretch fabric guide covers complete needle selection, stitch type, machine settings, and edge finishing guidance for all common swimwear construction scenarios.
Thread: Always use a high-quality polyester thread for swimwear. Avoid cotton thread or other weak threads, as they will degrade faster and lack the necessary strength in chlorinated water and sun. Polyester thread is strong and UV-resistant, and it won't break down like cotton when exposed to pool chemicals. Many sewing machine issues (like frequent thread breakage or skipped stitches) when making swimwear can be traced to low-quality thread; switching to a better-quality polyester thread often solves these problems. A good polyester thread (brands like Gütermann, Coats & Clark, or Mettler Metrosene, for example) will hold up to the stretching and stress. The key is quality – a cheap thread can cause frustration and weaken your final garment.
Elastic: Never use regular household elastic for swimwear projects – it's not designed to withstand the rigors of chlorine, saltwater, and sun. Common polyester or braided elastic will often deteriorate quickly in swimwear; you might hear it crinkle and break after a few uses due to chlorine damage. Instead, purchase swimwear elastic, which is specifically formulated for this purpose. Swimwear elastics come in a few types: the most popular are natural rubber elastic or a cotton/polyester blended swim elastic. Both are made to resist chlorine and UV damage. Rubber swimwear elastic is a favorite of many experienced makers because it has excellent longevity and a thin, flat profile that doesn't add bulk. It typically feels a bit tighter and firmer, ensuring your suit stays snug and doesn't stretch out.
Whichever you choose, make sure the product specifically says it's for swimwear – these elastics are formulated to withstand chlorine, salt water, and UV exposure without breaking down. Swim elastics are commonly available in widths like 1/4″ (6mm) or 3/8″ (10mm) for most swimsuit applications (such as around legs, armholes, and necklines). Also, remember to rinse swimwear after use – this helps the elastic (and fabric) last longer by removing chlorine or salt residues. Our spandex care guide covers the science of chlorine and UV degradation in elastane fibers – directly relevant to understanding why proper elastic selection and post-swim rinsing are so important.
By paying attention to these notions, you'll greatly improve the quality of your finished swimsuit. Sturdy polyester thread will keep your seams intact, and proper swimwear elastic will ensure your suit has the necessary stretch and recovery to fit well and endure many swims.
With the right fabric and supplies in hand, you're ready to bring your swimwear project to life. Remember to source high-quality swimwear fabric by the yard from reputable online shops, double-check your yardage for bikinis vs. one-pieces, choose prints or solids that suit your style and skill level, and always use proper thread and elastic designed for swimwear. Have questions along the way? Our expert help and advice page and FAQ are always available. Sign up for SpandexByYard Rewards to earn points on every purchase – happy sewing, and good luck with your next swimwear project!
