Finally: The most popular swim silhouette is one we've been rooting for since its early comeback. And according to the site, it's officially catching on with the masses, with tons of users clicking through the app's Buyable Pins feature and buying one (or a few) for themselves. It's no surprise, though — the silhouette is flattering, fresh (while slightly retro ), and one you can make all your own. Whatever your preference, the picks ahead will help you get in on this swim trend once and for all.