I have an upside-down triangle shape. i am a 4/6 on the bottom and a 10/12 on top. i have a short waist. i have very slim hips and virtually no waist. so, a typical jumpsuit or romper really doesn't fit me. this one is the exception! likely because it ties in the back, but the s fit me perfectly. the bottom half is easy, but not oversized. the top half of the jumpsuit is adjustable, so there is no issue with size. i am 36c on top, but i think that i could pull off the top, without a bra. you can