“Now there’s a woman,” says Oprah Winfrey in Diane von Furstenberg: Woman in Charge. The new documentary, which premiered at the Tribeca Film Festival’s opening night gala and is tied to an exhibition at DVF’s New York flagship, explores the life of the Belgian fashion designer. In many ways, von Furstenberg symbolizes the liberation of second-wave feminism. “We thought nothing could be better for you than promiscuity,” Fran Lebowitz says in the film. Von Furstenberg launched her career with a smart, simple design—the wrap dress. Inspired by ballet rehearsal wear, it was flattering to many shapes and cut from comfortable cotton or silk jersey. She was 22 and unstoppable. Filled with photographs, videos, and interviews, Woman in Charge takes viewers through the designer’s family history in the Holocaust, her affairs, her marriages to the German prince Egon von Furstenberg and the American businessman Barry Diller, and her nights at Studio 54. Directed by Sharmeen Obaid-Chinoy and Trish Dalton. —Jeanne Malle