That is a big variation! I probably won't be able to try all the sizes - time is a luxury for me right now... But just curious, since it's a wrap dress, how did you find the perfect "fit"? I figure one just wrap it around and call it a day lol. What constitute a "perfect wrap"?
For me the perfect wrap fits well without feeling like I am going to flash any part of my body while walking or moving in a normal way. Some wraps just fit better in the bust. When I was a size 2 in sheath dresses I wore a 4 in wrap dresses. I almost always had to wear a camisole or bralette so I wasn't flashing. Now that I am 15 lbs heavier I think that they actually fit my body better. I can size up now without too much material in the hips.