I can't say i'm surprised by my experience.  Like all of the costumes you can find in any box store, these one piece polyester costumes are hot, uncomfortable and not practical for children.  My daughter wears a 5 in almost everything, the 4-6 is too small.  The best part of the costume is the hat.  I'm going to make my daughter's costume from jeggings and a white long sleeve T and a good trip to the fabric store (rhymes with mo-ann's).  The hat is going to be tricky but not so much that i would consider keeping this costume.  Back it goes!  I made my son's Woody costume 6 years ago, it was adorable.