Emerald uses her semblance on (character) making them think their in their halloween costume when in reality they was walking around the party naked the entire time.
With the girls just have guys taking photos of their 'costumes'.
Same for males but if their dicks are tiny make jokes about it but they don't understand the joke is about them. But if it's big dick (EG: Jaune) have the girls try and get him to want them by any means which ends with him with a hard on that the girls all keep watching as they flirt with him.
