I'm 5'7\" and weigh 165 lbs, so I ordered this dress in a size Large. There's plenty of room in the hips and I needed it so much that I reordered a size Medium thinking this size would fit a little better. I'm going to keep this one because it's very flattering, not see-through, and the material is very stretchy. I haven't washed and dried it yet, so I don't know if it will shrink a bit.