My 8 year old wanted to be Toad for Halloween so I carefully read the sizing information on this and other listings and purchased the Medium, which corresponds to a USA size 8-10.  After waiting over a week for it to arrive, the packaging clearly states "USA size 8-10...for 5-7 year olds".  Shouldn't a size 8-10 fit an 8-10 year old, or did I miss something?  This would have been great information to have before I made my purchase.  My 3rd grader looks borderline silly in it, and he's not a big kid.  So be very careful when selecting your size and save yourself having to deal with costume exchanges before Halloween like me!  Other than that, it's a perfectly decent costume.