At press start screen press and hold L1, R1, L2, R2, Down, and select.
Different Outfits
Highlight any character and press L1 or L2 to get a different outfits.
Hidden Characters
To play as Master Ishii and James Harrison simply beat the one player mode with any character. Also to play as Hidefumi Minatoya go to training and complete more than a 100 combos in combo training.
Play as Animal
Go to 1-player mode,highlight "STAN THE MAN" then press L1 and START.