I'm 5'8", 137 pounds and bought a medium. Not too tight of a fit, which I prefer, with good coverage in butt and bikini area. If pulled up all the way, goes well above my belly button, but I like that there's some bunching fabric for a ruching-type effect that I can rearrange. Can be worn lower than belly button, with more ruching/ bunching effect, but I prefer to cover lots of stretch marks/ wrinkly belly pooch from pregnancies. I'm proud of the well-earned belly marks, but don't necessarily wa...