This video presents my method to be Silent Assassin (with accidents) in the mission Curtains Down.
I use the costume of the worker that go to piss at the begining, but rather to use his toolcase to hide the pistol, I go dowstair as if I wanted to use the costume of the white worker downstair.
It's not really logical, I know, but - for me - it is simplier to sedate the worker that piss, than the one in white, but I prefer (for no reason) to use the path downstair to reach the lodges. 8-)
As you will see, I encountered some visual glitches during this mission. I don't really know why, because it was the first time there were so many glitches when I play. ?_?
My method is not the "best" method. It is juste a "good" method to be Silent Assassin.