Inaugural Gowns of 11 Modern First Ladies Including Michelle Obama Are Featured. The Smithsonian’s National Museum of American History expands its popular exhibition, “The First Ladies at the Smithsonian,” with a new gallery featuring 11 gowns representing first ladies from Mamie Eisenhower to Michelle Obama, opening Wednesday, March 10. The new gallery, “A First Lady’s Debut,” focuses on the public introduction of 11 first ladies during the inauguration or beginning of her husband’s ...