This succeeds in slimming you slightly when you are standing up... but when I sit down it actually gives me a gut, which I don't typically have sitting down! I am 5'1" and 125 pounds with 34DD's, the medium fits perfectly (It's actually labeled as a small/medium.) Comfortable and doesn't ride up while you are walking. Works great under dresses, but under skirts it can be a pain since it is a dress. You can't tuck in shirts into it which leaves the lumps under tighter skirts.

All in all, works great to slim you down in tighter dresses, but don't bother if you need it under a skirt, if your dress is low cut or if you plan on sitting down a lot.