Ballet : leotard (voile skirt, wrapover cardigan are possible ) , ballet shoes. The chignon is necessary
Modern jazz : dress decently, not too much large, black jazz shoes. The hair must be tied
Hip-hop : dance sneakers ( preferable with white soles ) only used for the lessons
Other dances : ballroom shoes, character shoes. It's forbidden to come from the street directly to the dance studio. You change your shoes in the cloakroom.