The Liechtenstein collection that this is part of is now private.
From http://www.liechtensteincollections.at/de/pages/artbase_main.asp?module=browse&action=ce_theme&lang=de&sid=92343&config=T-2132005184727450,1,1,1,1,0,0.
Maria Josepha wears a post-Revolutionary dress, a simple garment with a cut out neckline and added on sleeves.
Keywords: 1784, Weickert, Princess Maria Josepha Hermenegilde, Prinzessin von und zu Liechtenstein, Fürstin Esterházy de Galántha, Liechtenstein family, Esterházy family, Austrian, curly coiffure, veil, bodice, scoop neckline, long tight sleeves, waist band, Empire waistline, close skirt, wrap