Pause game play, then hold L1 + Triangle and press Up, Left, Down(2), Right, Down, Up, Left.
Players Normal Size
pause the game play and enter the codes while holding L1 + Triangle to make the changes:
right, right, up, down down, left, right, left make players normal size
Unlock all Apparel
To unlock all apparel including shoes simply go to the Main Menu and then:
Hold L1 + Triangle while pressing Right, Right, Left, Up, Up, Up, Down, Left.