Mortred don't need to cover herself inside any cape or cloak. However traditional order outfit made even impact on her. The best from all phantom assassins or maybe just one and only. When she approach her target edge of her blade is not even visible for a second. Blended with pattern seen on her back it strikes only once so it seems that people were to fall from delicate material moved by the wind. Or is it so that she don't poses any weapon, and her presence is all that is needed to fulfill the oracle order.