I’m a true medium, & I got the medium, but I think I could have gotten a small. usually fashion novas rompers has no stretch at the waist area but this romper the back is made with the Smocked style so it stretches. the medium chest area was little loose for me and the length of the shorts are long. which i don’t mind. it’s 2 layers to the shorts. i haven’t wash it yet so Im not sure if it’ll shrink. also zipper was tough to zip up.