I was skeptical that an XS would fit me, since I usually wear a small or medium, but I listened to other reviews, and I'm glad I did! I'm 5'7" and 120 lbs, and the XS fit perfectly. I was worried that it would be too skimpy, but it's actually cut in a way that makes it form fitting but still classy- not to short and not too low cut. I did not have an issue with my bra strap showing in the back, although I do have a shorter torso. It's a very flattering dress, and I would recommend it to anyone.
This dress runs large as I wear a size 16 and I can fit the Large and it hides my less flattering stomach and looks great on me. I can even put it on without unzipping it.
Please bring this dress back in all the colors, size xxs!!! This dress is simply amaizing, fits like a glove and makes a statement every time!!! This dress is the best :)