I ordered this beautiful Prom dress for my daughter and she wears a 13/14 in any dress. Every homecoming and prom dress i have purchased that has zipped up the back has fit her or been a little lose, and we are talking about 8 dresses. I got this dress in a 15/16 accidentally and i told her well at least i can get it taken up. She tried it on an it would only zip up about 2 inches. I don't understand the size difference in this dress compared to all the other ones she has. So if you ware a 13/14 you probably need a 18 or 20......I just can't believe this......