A one-piece is not the conservative option — it's the more structured one. This edit gathers our swimsuits across the necklines we cut: plunging V fronts, halters that open the back completely, square necks, one-shoulder styles, and cut-out designs that expose more than most bikinis do. Because the piece is continuous, it holds and shapes through the torso in a way two pieces can't, which is why it suits high-leg cuts and deeper fronts. Fabrics include ribbed, textured and plain jersey in solids, metallics and prints. Torso length matters here more than bust or hip — if you're long through the body, favour the halter and adjustable-strap styles. If you're between sizes, take the larger one.