Use the following costume trade cheats:
Soki as Ryu: Left, Triangle, R2, R3, Square, R1, R1, Right, Left, L2
Jubei as Cammy: L2, L2, Right, Right, L3, Triangle, Left, L1, L2, Square
Ohatsu as Chun Li: R3, Right, L2, Left, Left, R3, L1, R1, Right, R3
Roberto as Guile: R2, L2, Left, L1, Left, Right, R3, Square, Square, Triangle
Tenkai as Ken: L3, L3, R3, R3, R3, Left, R2, L1, Square, Right