Pretty sure there isnt u can't even put suits from the old game on but there are some suits that are called ass but there not really assassins creed assassin suits

how??

Buy Dlc pack : Darius dlc pack.

Depends on what you mean, there are no skins for previous protagonists like in previous games, if you want the master assassin armor you need to get the legacy of the first blade dlc and complete it I think you might have to kill all the members of the order from that dlc to obtain it I don't remember,

it's darius dlc pack