16 Best One-Piece Swimsuits 2025, According to Editors

To be honest, a one-size-fits-all swimsuit sounds like a nightmare. However, Youswim has not only figured it out but mastered it. The Aplomb One-Piece is made of an ultra-stretchy ribbed material specially engineered to expand and contract to fit most bodies. It technically comes in two sizes: Stretch I for sizes 2 through 12 and Stretch II for sizes 12 through 24, plus it is available in lots of fun colors. Jessie Quinn has owned this swimsuit (plus two others from the brand) for nearly five years and says it’s worth every penny for its fit.

“While it is pricey, my Youswim bikinis and one-piece are the only swimsuits I’ve owned for more than a couple of years, thanks to their ability to fit your body at any size,” she explains. “I have friends whose Youswim swimsuits fit them before, during, and after pregnancy, which is incredible and also not possible with most other brands and styles out there.” The quality is also impressive and holds up well, even after years of wear. “My one-piece still looks as good as the day it arrived on my doorstep,” she adds. “It still stretches the same and hasn’t faded, pilled, or snagged.”

Sizes: 2-12; 12-24 | Material: Elastane, nylon | Colors: 11 | Padding: No

• Pros: Fits up to size 24; Comfortable fit; Long-torso-friendly; Quality holds up after years of wear; OEKO-TEX® certified materials
• Cons: Takes a long time to airdry