Size down
I first tried this dress in my usual size 4, and thought it was a pretty fabric but boring and not particularly flattering.  i later read the positive reviews and the next time i was in the store i tried it in a 2, and it was so much better!  very pretty shape.  uiu might want to size down because the shoulders were set a little wide apart and bodice was gapping in my usual size.  for reference, i'm 5'6", 125 lbs.