Got this for my 5 yo daughter for Halloween '09.  She is a bit smaller than the average 5 yo, but the CHILD sz MED fit her very well as per sizing offered by seller.  Gorgeous costume no other child had the same one in the area.  Paired this with child's black fishnet stockings from Wal-Mart and glittery Converse sneakers and received many compliments!  My daughter loved it!