In Assassin’s Creed: Revelations for the PC, PS3, and Xbox 360, there are a couple bonus costumes you can unlock by performing certain tasks in the game.
Here are the bonus costumes you can unlock, and what must be done to unlock them.
Altair’s Grandmaster Robes – Get 100% Sync in DNA Sequence 8
Desmond Miles’ Outfit – Complete all five of Desmond’s memory sequences
Ishak Pasha Armor – Complete the Hagia Sophia challenge level
(To unlock the Hagia Sophia challenge level, you need to collect all ten of Ishak Pasha’s memoir pages)