Enter these codes in the options menu for your game. After entering them, exit the game and return to the options menu. If you have a memory card in when you go to the main options menu, you will not have to enter the codes again; it will save them for you.
Dynamic Duo - STXSTTTS - Batman and Robin
Default Color Pallete - STXSTTTX - ?
Invisible - STXSTTXS - just hair, shorts, shoes, numbers
Formal - STXSTTXT - tuxedoes as uniforms
Federation - STXSTTXX - Data and Spock
STXSTTSS - EA CUSTOM TEAMS
Oktoberfest - STXSTTTT