Although it's unfortunate that she didn't get to wear it this year b/c of Hurricane Sandy which tore our area a part.  So Halloween was more or less skipped this year for us.  But the costume fit her perfectly. I'd say that they run just slightly big size wise as my daughter is tall for her age and it was a perfect fit length wise for her.  (If my review was helpful, let me know by clicking "yes" at the end of my review!)