My 5 year old shows up to every party in "theme".  She was a hit in this costume. My daughter was a muscular size 6 when we bought this and it was quite snug, especially the calves which are NOT stretchy material.  If your daughter is a slim 6 this is good, if not try the next size.  Also I would recommend white underwear and a cami under the top since it is a tad see through.