The Cinema Society and Victorinox gave guests–including Mamie Gummer, Jessica Joffe, and Hamish Bowles—occasion to revisit “Brideshead Revisited” last night, at the New York premiere of Julian Jarrold’s new film adaptation of Evelyn Waugh’s classic novel of class friction and forbidden love in interwar Britain. The after-party at the Gramercy Hotel rooftop was nice enough, but it had nothing on the impossibly posh bygone world depicted on-screen: waistcoats, white linen suits, and sybaritic afternoons spent punting at Oxford, where an aspiring artist (Matthew Goode) falls in with a glamorous aristocrat (Ben Whishaw) burdened by Catholic guilt. Goode seemed in awe of the period grandeur. “You’d have to go to Buckingham Palace” to find an English estate as majestic as Yorkshire’s Howard Castle, the film’s Brideshead stand-in, he declared. Co-star Hayley Atwell revealed that she donned an “itchy bob” wig for the role. Also, Spanx. “They were so restricting, and poor Julia is such a restricted character that it actually gave me a lot more to work with,” she insisted—surely one of the most high-brow justifications ever given for covert curve control. But not a bad one, come to think of it.