…that John Cameron Mitchell, director of the fourth and last installment of the Lady Dior saga, apparently couldn’t leave his Hedwig and the Angry Inch wigs alone. At least judging from the giant feather headpiece worn in the epic finale, set in part on the London Eye, in which Marion Cotillard steals the hearts of men as Lady Grey through a magic handbag. The video, a modern-day silent film, will be unveiled in full December 8 at the Lady Dior site, but here’s a sneak preview…