Nice thick fabric and mostly cotton, which is great! I am 5'6 155lb with a big booty and smaller top. I usually wear an M or L in dresses. I order an L and it fits in the chest area but is too tight around my butt. Since it's cotton I am a bit worried about shrinking in the wash however they don't have XL so I'm gonna hope it stretches a bit. Fingers crossed!

UPDATE: I decided to keep it and give it a try anyhow because the mustard color is so beautiful. I'm so glad I did! The butt area stretched out and the dress pretty much shaped to my body. It was so comfortable I didn't want to take it off to go to bed.