J CREW large (?) Black mini dress with ruffles

J CREW Large (?) No size label. Please see measurements below. Black ruffled mini dress Back zip closure Elasticized waist approx 30" Pit to pit approx 22" Pit to bottom approx 28" Front at chest has a hook, but I don't know the reason for it. I have left this untouched for you to decide what to do with it. See photo. Otherwise, it is in Great Condition! I have discounted significantly.