More 18th century costume candy, but of the film variety! This beautiful gown was made for Keira Knightley as Georgiana, Duchess of Devonshire, in The Duchess (2008). Lovely, isn't it? . It c. 1790 mourning round gown Dressed in Black: 17th and 18th Century Frock Flicks The Little Black Dress The Fashion Historian 18th Century Inspired Little Black Dress Masquerade Ladies Black Georgian Costume. 18th Century Costumes. Venetian Ball