Private
Wii
App
RSBE
PF
Fighter
*fighter's name*
*Actual file*
Make sure the fighters name is like in the apropriate fighters name list or it won't work. Texture hacks for example on Zero Suit Samus would be named SZerosuit00(then if it's another costume you want to replace it's the same thing but 01-5, the apropriate costume being the number of times you press A to get to it.)
Just go to the "dynamic SD loader" topic, there's tons of stuff on there about it