There are quite a few bonus costumes you can unlock to use in the new co-op Raid Mode in Resident Evil: Revelations for the Nintendo 3DS.
Here are the costumes you can unlock, and how to unlock them.
Chris (Ship) – Reach Player Level 30
Chris (Snow) – Complete episodes 1 through 3 in story mode
Jessica (Ship) – Complete all Raid Mode stages on the Trench difficulty
Jessica (Snow) – Reach player level 10
Jessica (Terragrigia) – Reach player level 40
Jill (Beach) – Complete the first Raid Mode stage
Jill (Ship) – Complete episodes 1 through 3 in story mode
Keith (HQ) – Finish 50 missions
Keith (Snow) – Complete episodes 4 through 6 in story mode
Parker (Beach) – Reach player level 20
Parker (Ship) – Complete episodes 1 through 3 in story mode
Parker (Terragrigia) – Find one rare weapon in Raid Mode
Quint (HQ) – Reach player level 50
Quint (Snow) – Finish 100 missions
Check out my other article for the full list of unlockables in Resident Evil: Revelations for the 3DS.