Akuma’s Nostalgia costume can be altered at the selection screen.
Looks like Street Fighter V “Nostalgia” premium costumes will share the input-code Easter eggs of the Swimsuit, Capcom Pro Tour, and Halloween lines, not to mention Urien; as seen at the PlayStation Experience, Akuma can shrug off the gi top of his classic costume and go shirtless with the application of a button code at selection.
It is unconfirmed if the code is the same as for the other recent costume sets (LP+MP+HP+LK and hold UP on the joystick), or if it’s a different input, but as all costume codes are the same except for Urien’s (LP+MK+HK), it’s most likely the same as the others. You can see the modified outfit in-game in the footage below.
Akuma will join the Street Fighter V roster officially on December 20th, along with other new content.
Thanks to Joris for the tip.
Source: Kevin Burnout Kim