Russian supe Sasha Pivovarova is universally celebrated for her unique look, that of a possessed alien hailing from a frozen planet and possibly crossed with a husky. So Mert Alas and Marcus Piggott’s decision to cast her, along with male supe Diego Fragoso, in their futuristic, otherworldly fashion film for Giorgio Armani’s fall collection, Boudoir, was a no-brainer. In her icy element, she’s never looked better…