Slim fit bodysuit with snaps detail at front neck and functional snap closure at crotch. Ribbed fabric has good stretch. Stay in your normal size. If between sizes, size up or down depending on preferred fit. You may also size up if you have a longer torso or if you prefer a looser fit.
Melissa is 5'5 and wears a size Small (S).
Model is 5'9 wearing an Extra Small (XS).