"I got this dress in medium b/c there was no small or xs and then I saw the small, so I returned M, and now there is xs... I am usually size xs, but I will probably just keep small since their shipping is super slow.
I am 5'6" and 120lbs and size A.. and it is very roomy and loose, but I really did not see much difference in Medium and Small. I think any size would have been loose on me. They were all baggy, but I love that look, and that look fits me, so I am very happy with it. Material is very good and it has different pattern inside, which is a beautiful detail. I also love how it is long in the back."