Roxy always runs small so Keep that in mind.

Does Roxy run small or big?

They do run small, though -- buy one size up.

Should you size up or down in swimsuits?

“Swim fabrics stretch a bit when wet, so sizing down or staying true to size is better when you're spending most of your time in actual water,” she says. “If you're staying dry most of the time, sizing up could help you feel more comfortable since the natural stretching won't happen when the suit stays dry.