A football

A football? Not a bad idea to go as a footballer so you strut over to the changing room and find 2 pom poms lying there. You pick them up, wondering what they're doing there as they get hot. You try and put them down again but they're stuck to your hands! Your shoes turn white and become 4" heels with matching white socks. Your pants begin to fuse and shrink up your leg transforming into a cute little red skirt, and your tee shirt follows a similar pattern, turning into what looks like some sporty bra. Your chest sprouts 2 perky B-cup breasts and your penis shrivels up inside, you moan in a feminine tone as your hair grows and magically ties itself into ponytails, you've become the football cheerleader, you knew there was some kind of trick to this store...