From Wikimedia; sepia tone removed and image enlarged one tenth by gogm.
The déshabillé Directoire fashion has evolved into Empire era style worn by Harriet Arbuthnot with a lace modesty piece. Her sleeves are complex - the sleeve to right looks like a mameluke sleeve while the sleeve to left looks like it may have a notched section.
Keywords: Lawrence, Ensom, Harriet Fane, Harriet Arbuthnot, Fane family, Arbuthnot family, British, curly coiffure, square neckline, long close virago sleeves, cuffs, waist band, Empire waistline, close skirt, necklace