Presently, the best way to separate costumes is by having a Costume entry for it. The Gallery feature doesn't appear to be functional at least not at the present time. We're sorry for the inconvenience - I think the reason it might not be there anymore is because having a costume listing and a gallery for the same costume may have been redundant.
Animazement (NC) - Anime Festival Orlando (FL) - Holiday Matsuri (FL)
Upcoming costumes : Harle from Chrono Cross, Narciso Anasui from JoJo's Bizarre Adventure Part 6, Lina Inverse (bunny suit) from Slayers, NiGHTS from NiGHTS into Dreams...