From the museum's Web site.
This shows Georgiana’s large coiffure under a cap tied with bows.
Keywords: 1784, Downman, Georgiana Duchess of Devonshire, Georgiana Cavendish, Duchess of Devonshire, Duchess, Spencer family, Cavendish family, British, bouffant coiffure, hat, bows, fitted bodice, scoop neckline, close sleeves, natural waistline, full skirt