Countess Harriet's dress is not especially fancy, but her lace lappets are. This image is dated 1830s, but she has a high waist and close skirt - 1820s.
Keywords: Countess, British, hurluberlu coiffure, feathered hat, lappets, lace, scoop neckline, criss-cross bodice, modesty piece, long close sleeves, cuffs, belt, Empire low waistline, close skirt, brooch, gloves, wrap