Got this for my 7 year old daughter for a trip to a resort in May. We ordered size 8. She tried it today... she is athetic so waist is a bit big (but I can always sew the sides to make it a bit smaller if needed when we go) the rest of the tail fits perfect... haven't tried it in water yet... will update when she does in May (maybe before that if they allow her to use it in a pool)
Looks very well made and very pretty! She did a mermaid school renting a tail in Florida a few months back and was able to swim great with it... of course thats all she asked us since we came back from last trip ;)