Completely reworked from the ground up, this patcher will allow you to enable 4 additional costumes for every single character built directly into the game itself without any additional programs. Please follow the patching instructions in the video.
To activate the new costumes highlight a character and hold down R1/R2/L2/R2 or LB/RB/LT/RT then select the character. This will work both on the character select screen and the lobby when selecting and editing a team.
This does NOT work for cracked version of the game, only the steam version.