I got this one in medium, and it is a little big/loose on me, but is super cute and comfortable.  I also got the red floral print in a small, and it fits much better and is very cute/comfy. I am 5'6" and 145 lbs, 32D for reference.  The cord around the waist is not functional- just decorative (as in tying it tighter, doesn't really tighten the dress around your waist very much).