L1/L2, R1/R2, LB/LT, RB/RT = changing Head/hairstyle or upper body when selecting the character.
Left or Right on D-pad = eyewear
X button / A button = Default underwear
/\ button / Y button = Alternate Underwear 1
|_| button / X button = Alternate Underwear 2
X + /\ button / A + Y button = Alternate Undwear 3