One bratty kid comes in and he demands your "coolest" costume. So you pick a white Eskimo one, plus you decide to teach this brat a lesson by including that along with the gender change the costume will all make the new woman a bimbo and give her a massive fetish for masturbating and having sex out in the cold.
Once the change was done and the costume was payed for the woman left well giggling like an idiot.