It was all about tuxedo dressing at last night's Dior and Bergdorf Goodman cocktail party celebrating Raf Simons' debut RTW collection. Julia Restoin Roitfeld, Vlada Roslyakova, and Olympia Scarry all donned the menswear-inspired look. Meanwhile, Chelsea Leyland and Dita Von Teeseboth went for head-to-toe black at the Dita Von Teese & HSN launch celebration at The Lion. Click through to see their looks, as well as all of the other stellar looks from last night.