Her article in The Peerage is here.
Back in the UK Ladies wore close skirts and Empire waistlines, but could wear something other than square or scoop necklines as shown by Lady Garbett. Strong detail-enhancement shows her waistline is formed by a waist band with draw string.
Keywords: 1800, Hoppner, high straight coiffure, head band, sweetheart neckline, quarter length sleeves, waist band, Empire waistline, close skirt, brooch, wrap