For reference, I'm 5' 6'' and weigh about 140 lbs with an athletic build. My measurements are chest 35 in, waist 29.5 in, hips 37 in, and thigh circumference 23 in.
I haven't used the suit fully yet, so I will comment on the fit. I was nervous to order the small due to being a bit more muscular, but it fits great. Tight, but not too tight. Yes, you will have to squeeze it over your hips, but it's supposed to be form fitting, which it is for me. Love the design and feel of the suit.