For your next cocktail fete, keep Jena Malone's chic party trick on hand. For Chanel's book party, the actress styled up a slinky, satin gown with a little edge. We love how a leather jacket plays against the glamour and adds that cool-girl factor to her look — we also love that this styling trick is perfect for Fall. Feeling inspired? Just shop our picks to channel Jena's sultry-cum-slick style.