From Wikimedmedia.
Elena's dress has features a delicate lace bertha ornamented with a pearl brooch.
Keywords: 1829, Brullov - Karl, Elena Pavlovna née Württemberg, Grand Duchess, Württemberg family, Romanov family, hurluberlu coiffure, Apollo knot, off shoulder straight neckline, bertha, lace, quarter length puffed sleeves, necklace, earrings, brooch, wrap