Designing a stunning print for your new swimwear line is an absolute high. You’ve nailed the color palette, balanced the pattern, and can already picture it trending on Instagram. But here is the hard truth every swimwear founder learns early on: a gorgeous design on a screen is only as good as the fabric it’s printed on.
Nothing hurts a young brand’s reputation faster than a bikini that turns see-through when wet, loses its shape after two pool visits, or turns a chalky white when stretched over curves.
You don’t need a degree in textile engineering to make smart decisions. As a swimwear manufacturer, we’re here to break down the essentials into simple, actionable choices so your debut collection looks premium, feels incredible, and keeps your customers coming back.
1. Polyester vs. Nylon: Which One Fits Your Vibe?
When sourcing swimwear fabric, you’ll quickly realize that almost all performance swim fabrics are a blend of synthetic fibers. The base fiber usually comes down to two choices: Polyester or Nylon. Neither is “better”—they just serve different brand styles and budgets.
Polyester: The Print Powerhouse & Budget-Friendly Option
If your brand identity revolves around vibrant tropical graphics, detailed florals, or bold artistic patterns, polyester is your best friend.
- Why you’ll love it: Polyester takes print inks remarkably well through a process called heat transfer printing. Colors come out exceptionally vivid and sharp.
- Durability: It is naturally resistant to chlorine, salt water, and UV rays, meaning bright prints stay bright far longer.
- Best for: Fast-fashion lines, active/sports swimwear, intricate artwork, and brands looking for a cost-effective start.
Nylon: The Premium, Super-Soft Choice
If your target customer expects high-end boutique quality with a “touch-me” softness, nylon (often called Polyamide in Europe) is the industry standard.
- Why you’ll love it: Nylon offers a buttery, silky hand-feel that hugs the body like a second skin. When printed digitally, it achieves rich, deep, and sophisticated color tones.
- Durability: While softer, nylon requires a bit more care with chlorine and heat compared to polyester, but it offers superior stretch recovery.
- Best for: Luxury bikinis, minimalist chic styles, and high-end resort wear.
High-Quality Stretch
Base fibers give fabric its texture, but Spandex (or Elastane/Lycra) gives swimwear its soul. Look for a blend that contains roughly 15% to 22% Spandex.
Pro Tip: Always ask your manufacturer for chlorine-resistant spandex (such as CREORA® HighClo™ or LYCRA® XTRA LIFE™). Standard spandex breaks down quickly in pool water, leading to sagging bottoms and loose straps after just a few wears.
2. Avoiding Common Fabric Disasters
When starting out, you want to eliminate customer complaints before they happen. Here are three common traps new swimwear brands fall into and how to avoid them:
The “White Stretch-Out” Problem
Have you ever put on a printed swimsuit, stretched the fabric with your hands, and watched the background turn a weird, chalky white? That happens when a print sits only on the very top layer of a white base fabric. When the fabric stretches over curves, the white underneath shines through.
How to avoid it: Choose high-density fabrics or ask your manufacturer for “dyed-through” bases for darker prints.
The See-Through Trap
Light-colored or white-background prints are notorious for going sheer when wet. Fabric weight is measured in grams per square meter (GSM).
- Too Light (< 180 GSM): Cheap feel, high risk of being see-through.
- The Sweet Spot (190 – 220 GSM): Perfect balance—thick enough to offer coverage and support without feeling heavy.
Add the Lining
A great outer fabric is only half the equation. High-quality swimwear always uses a dedicated stretch lining. A soft, dyed-to-match inner lining prevents sheer moments, adds gentle support, and makes the swimsuit feel instantly more premium.
3. Eco-Friendly Fabrics
European and American consumers—especially Gen Z and Millennials—are actively looking for sustainable fashion. Offering eco-friendly swimwear is no longer just a trend; it’s a powerful selling point for new brands.
- REPREVE® (Recycled Polyester): Made primarily from recycled plastic bottles. It prints like a dream, performs like traditional polyester, and gives you a great story to tell on your hangtags.
- ECONYL® (Recycled Nylon): Made from ocean waste like abandoned fishing nets and industrial plastic. It provides the same silky, high-end feel as virgin nylon while reducing environmental impact.
Using certified recycled fabrics allows you to proudly label your products as sustainable, making your brand stand out in a crowded market.
4. How to Order Samples Like a Pro
Before placing a bulk production order, follow these simple steps to test your fabric choices:
- Order a Fabric Swatch Kit: Feel the weight, stretch, and softness of different fabrics in your own hands.
- Request a “Strike-Off” (Sample Print): Print a small square of your actual artwork on your chosen fabric. Colors on a backlit phone or computer screen never look 100% identical to ink on fabric.
- Do the Hands-On Stretch Test: Grab your printed sample and pull it firmly with both hands. Does the color stay true? Does the fabric snap back to its original shape quickly?
- Wet Test It: Get the sample wet, wring it out, and see if it holds its structure or turns transparent.
Final Thoughts
Building a successful swimwear brand doesn’t require knowing every technical term in the book. It’s all about picking the right base for your aesthetic, ensuring your customers feel supported, and partnering with a manufacturer who guides you along the way.
Ready to bring your swimwear designs to life?
Contact our team today to request a beginner-friendly Fabric Swatch Kit or to discuss sample prints for your upcoming collection!