WANG’S WEDDING WISDOM: Vera Wang celebrated “20 Years, 11 Dresses,” her museum-style retrospective of wedding gowns at Bloomingdale’s 59th Street, with a store appearance on Wednesday. With her dresses one floor below, Wang arrived on the sixth floor to be interviewed by Stephanie Winston Wolkoff, director of Lincoln Center’s fashion week and offered practical advice as well as gossip. “I dress a great many rock stars and I’m always surprised when they want the most traditional dresses,” she said. On the wedding gown she designed for Jennifer Lopez: “It took eight months and we made three dresses. It pushed me out of my own box and comfort zone.” Read: Lopez almost pushed her over the edge. Wang drew on her own marriage, noting, “Begin your life together as a joint venture.” She recalled that during her engagement her future husband developed an avid interest in china patterns, to her dismay. Being a designer, she felt decor was her domain. Today, she’s more laid back. “My china can be used for takeout Chinese or a formal Thanksgiving table,” she said of the Wedgwood license.