Check yourself out

The bathroom you're changing in has a full length mirror hanging on the door. You make a bee-line for it. What it shows you is totally unfamiliar at first.

In the mirror you see a young woman about your age, cute, petite, 5'2" or maybe 5'3", probably 95 pounds soaking wet, with shoulder length wavey light brown hair. She's wearing nothing more than a white cotton bra, lace panties, and a curious expression. You feel a little turned on until you realize the girl in the mirror is you! When you do you feel even more turned on. You feel a pleasant warmth building between your legs, but you also feel confused and a bit frightened.

You have no idea how putting on this costume turned you into a girl or if taking it off will turn you back again.