I just got this leotard, and it's really nice :) The seams are more obvious in real life than in the picture. The seams have a sort of slimming effect too. I'm 5'3'' and around 100 lbs (ish, I'm not sure, maybe lighter) and I got a small, and it fits perfectly. I probably could have gotten an extra small, but when I get taller, it wouldn't have fit.
The material is nice--not too thin, and soft stuff :) I recommend this leotard :D