What happened to the Givenchy gown in the film "Sabrina"?

Does anyone know what happened to the white strapless gown Audrey Hepburn wore for the party scene in the film "Sabrina"? It was designed by Hubert de Givenchy.|||If I am not mistaken, I believe that dress is now in a museum. Many of Audrey Hepburn's gowns and dresses ended up in private collections and museums. Several dresses are held in the archives of the House of Givenchy and I would be surprised if that gown was one they held onto and now loan to museums.