This is an enlargement of Duchess Theresa's dress showing her dress has an opaque under-bodice while the criss-crossed panels are see-through.
Keywords: 1810, Gérard, Therese of Mecklenburg-Strelitz, Duchess, Princess, Mecklenburg-Strlitz family, Thurn und Taxis family, German, curly coiffure, tiara, vee neckline, criss-cross bodice, waist band, Empire waistline, close skirt, necklace, earrings, bracelets, wrap