it's social stealth, remember. it doesn't matter that she's the only person wearing white in a huge city, as long as she doesn't accidentally run up the wall and jump off into a guard while trying to turn a corner she's fine.
YuriTenshi said: I suddenly have a strong urge to fight on the side of the Templars...
Irrational hate is irrational.
In regards to the picture, I'd imagine wearing something like that would be impractical for assassinations, the most obvious fault being that she's way too noticeable even in a crowd.