One piece, nothing to ride up

The appeal of a bodysuit is that there is no waistband and no hem — nothing to shift, roll or expose a strip of back when you duck-dive. That makes it the cleanest possible layer under a wetsuit and a genuinely low-fuss option for long snorkelling sessions. The four-way stretch works with your body through a full kick cycle rather than against it, and the second-skin fit means no water pooling in loose fabric. If you prefer separates, the women's dive rashguards pair with anything.