You recognize the boys in this group and remember that all their family are very religious and christian, so you think it be funny to give each of them a different nun costume. You include in the change that everyone will consider these outfits perfectly acceptable church attire. After their change you convince the new girls to wear these outfits whenever they go to church.
They pay and leave the store and a few weeks later you start to hear rumors that all five of those girls are in trouble since they've been caught masturbating during church services, at home, in public, and just about anywhere. Plus two of the girls were apparently caught have sex with each other in the church restroom.