This is a well known portrait of Princess Victoria of Saxe Coburg Saalfeld, Duchess of Kent and Queen Victoria's mother in color.
Ruffs, or cherusques, came back into fashion in the Napoleonic era, and hung on for a while longer as shown here.
Keywords: 1820, Duchess Victoria, Princess, Wettin family, Hanover family, British, curly coiffure, sweetheart neckline, cherusque, tiara, jeweled necklace, earrings, brooch, bracelets, wrap