The School Girl outfit is a dress which resembles Sailor Moon's outfit from the television show/anime. It is sold for 110 diamonds.
The outfit consists of red boots with white borders at the top, a blue pleated skirt, a pair of long white gloves with red objects at the end of them, and a large red bow around the top portion. Players use it on many different characters, such as Macie or Joe.
It is not very hard to save up for.