Perhaps no other First Lady wore a string of pearls with such cool elegance. "Jacqueline Kennedy: The White House Years"—an exhibition honoring her style and commitment to culture—opens at the Metropolitan Museum of Art next month. Organized with Boston's John F. Kennedy Library & Museum, the show takes us behind the look that spawned millions of pillbox hat—wearing imitators. But Mrs. Kennedy didn't just make Oleg Cassini and Halston famous. The 31-year-old First Lady oversaw the massive White House Restoration Project, supported the National Cultural Center (later renamed the John F. Kennedy Center for the Performing Arts), and helped save the Egyptian temples at Abu Simbel (in thanks, the Egyptians gave us the Temple of Dendur, and Jackie chose the Met as its home). Mrs. Kennedy slipped naturally into her role as diplomat—she's shown here on a visit to India in 1962. Although her headline-making wardrobe now dates back 40 years, this exhibition confirms that Jackie's legendary grace will always be in fashion. Metropolitan Museum of Art, 1000 Fifth Ave., New York; May 1—July 29.