"I bought this for my daughter who wears a size 3 in Juniors...this fit perfect...the only reason I knew to order this one in an Adult Medium was because I ordered another costume (half angel half devil) from here and it was WAY TOO SMALL (junior 7-9-was sooooo tight)...this costume fits great, she loves it, we decided to wear the purple collar folded down, much easier, wont' keep falling, and you see a lot more purple, really makes the colors pop...I give it a 5 because my daughter is 100% happy!"