What ways can you get the harlequin costume in ac brotherhood?

buy the new DLC which brings you the harlequin, the officer, and 4 new characters which are the:The Pariah, The Dama Rosa, The Knight, and The Marquis, Also it brings you 2 new modes: Assassinate (Kill anyone you wish Free for all), and Escort ( work in teams to scort a VIP (protect them from the hunters) and Killed them before getting the points) also 2 new locations Alhambra (Spain) DAY AND NIGHT, and 8 more missions of The Davinci Disappearance and 2 missions that were only on special edtions game (the Aquaduct, and Trajan market), Also 10 achievments, and more