Mrs. Mellon at the opening of the exhibition "Masterpieces of Impressionist and Post-Impressionist Painting" on April 23, 1959. © National Gallery of Art, Washington D.C., Gallery Archives. The evening ensemble worn by Mrs. Mellon in the image was shown at the monographic exhibition dedicated to Cristóbal Balenciaga organised by Diana Vreeland at the Metropolitan Museum of Art in New York, 1973.