In Assassin’s Creed: Brotherhood for the PS3, Xbox 360, and PC, there are several capes you can unlock by completing certain tasks.
Auditore Cape – Complete the Rebuilding Rome mini-game
Borgia Cape – Collect 100 Borgia Flags
Medici Cape – Reach level 30 on the Assassin’s Creed: Project Legacy facebook game
Venetian Cape – Reach level 30 on the Assassin’s Creed: Project Legacy facebook game