11 Best One-Piece Swimsuits in 2025, Tested for Style and Comfort


“I feel as smooth as a seal swimming in the Sunday suit. It holds me in using a single piece of this silky, almost-seamless Lycra-nylon blend, and while material is thin enough to show some nip, I like how airy and quick-drying it is.

The main drawback our team found is that Left On Friday’s swimsuits don’t fit true to size (they run small), and the cupless designs don’t support large busts very well. However, as someone with a narrow ribcage and 34B cups, I found it hugged me in all the right places.

I’m 5-foot-9 and mostly legs, so I went for the Tall size. I’m relieved I did, because the shoulder straps are short and non-adjustable. If you’re anywhere above 5-foot-6, go for the Tall size so it’ll stretch to fit your torso. Unfortunately, the XXL size is limited to three colorways, so it’s not as inclusive as we’d like.

In the rear, its seat coverage is minimal — not a thong, but it definitely shows cheek — and it stays put so I don’t feel like I need to readjust constantly. Down in front, the high-cut legs are comfortable and smooth. No risk of camel toe in the crotch area, either.

The color you choose will have a lot of influence on how the Sunday suit will serve you. I went for a shimmery bronze shade called ‘Tan Lines.’ It’s also my go-to suit for the spa, whether I’m braving the cold plunge or sweating in the sauna.” — Gabrielle Chase, senior associate style editor, Insider Reviews





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