I'm 5'2, 128 lbs, and got a medium! It's a bit tight in the crotch area and cuts up pretty high. The top portion does feel loose; the cup size should be smaller or tighter to keep the ladies in. But I adjusted the strap, and that seemed to help. It is a very cute body suit; I recommend it, just keeping the points above in mind if you have challenges with bodysuits that cut high/small crotch area fabric.
Fantastic. Even tho it’s made for women with small boobs, as a 32F I can make this work. Quality material.