I wear a size 12 and ordered an XL.  My daughter is a size 6 and could not fit into this costume.  Her friend is a size 4 and she barely squeezed into it.  Maybe it was sized wrong, but an XL should be way too big for a size 4 person!  i actually measured the waiste of the costume I received and the waiste measured 29 inches!  That is not an XL! I am obviously returning this item which is too bad because it is a beautiful costume and just what I was looking for.