I have something to say about the assassin's outfits:
The assassin's rank can be identified by looking at the color of their suits. The standart assassins wear dark blue suits, the "newcomers" have gray costumes, the master assassins wear black outfits and the elite assassins, like Vain (and before him, Daud and Billie Lurk) wear dark red outfits.
My character wears the dark red suit since supposedly he is Vain's advisor, but if you have any sort of problem with it, I can change it easily.
And about the masks: as far as the wiki goes (:P) all assassins wear the same mask (including the leader), but i think we can all make an exception on this one.