Press Select when selecting the following characters to get their alternate costume.

Kyo Kusanagi: Original school uniform.
Yuri Sakazaki: Original long braids.
Elizabeth Blanctorche: The King Of Fighters 11 outfit.
Joe Higashi: Tiger stripes outfit.
Andy Bogard: The King Of Fighters 2001 outfit (Eiji Kisaragi alternate)
Takuma Sakazaki: Mr. Karate outfit.
Raiden: Big Bear outfit.
K': Additional colors.
Ralf Jones: Camouflage outfit.