Like many people, we were deeply suspicious of one-size-fits-all swimsuits. To be frank, in the world of clothing, a one-size anything would make us raise a brow, so a close-fitting, hard-to-shop-for category like swimsuits had us feeling really skeptical. But these popcorn or crinkle suits are lauded online for being ultra-flexible, with a single garment accommodating a range of sizes. For example, a popcorn suit we tested from one brand claims to fit sizes 2 to 12.Given the popularity and plentiful positive reviews for one-size suits, staff writer Zoe Vanderweide decided to put them to the test in our guide to the best women’s swimsuits. And, to our surprise, we actually found some crinkle suits that we really love. In the photo above, you can see the proof: Two models, size 2 and size 12, are wearing the same-size swimsuit. We know it sounds outrageous on paper, so I’m here to walk you through how these suits work, how to spot one worth considering, and how to avoid the fakes.