Well, now it can be told:
Elizabeth Olsen’s in some kind of a cult, and they have VERY SPECIFIC wardrobe requirements.
She did, however, get to take these sacrificial vestments and meet James Norton:
James Norton, your tie is so short. You also don’t look NEARLY sad enough for me, as I prefer you in Terribly Sad British Man In a Period Piece mode. Why are you doing this to me?!