My daughter Ali was Supergirl, obviously, for Halloween this year. Pilar found a big kid's costume at a garage sale and my mom reworked it to Ali size. She had a blast all day, despite some initial tears.
When she got home from trick-or-treating the first thing she did was grab her Supergirl and Stargirl action figures and fly them around the living room...I've already apologized to her in advance of all the social damage that I'm causing her. ;)