Me - 5'6", 27" waist, short-ish torso
The XS bodysuit is a nearly perfect fit for me. Sizing is right, but the cut doesn't hug my back the way I want it to, so I cinched the back with a safety pin. It's also a bit of a tight fit for my average-sized junk
(Size purchased says S b/c it didn't give me the option to choose XS)