Curve-hugger!
This dress is so incredibly flattering. I'm pear-shaped (large hips) and ended up exchanging my S for an XS (usually order size S from Lulus), and couldn't be happier! The S was a little baggy in some areas, but the XS hugged every curve perfectly without being too snug. It can be tight to get on, as others mentioned since there isn't a zipper of any kind. But it fits like a glove once it's on!