Gravity Rush features different costumes available for Kat to wear. Her default costume is worn at the start of the game. The schoolgirl outfit is obtianed in Episode 7 when traveling to Pleajeune. The other three costumes are obtained by buying the DLC packs. Kat can change her costume anytime by going to her house.
Costume name from left to right: Military, Maid, Default, School Girl, Spy
Shifter 1.0 (Default) Costume. Available through collecting 5,000 Dusty Tokens in Gravity Rush 2.
Schoolgirl 1.0 Costume available through "Too Many Secrets" Main Story Mission in Gravity Rush. And available through collecting 2,000 Dusty Tokens in Gravity Rush 2.