The outer layer of Empress Elisabeth's dress in this photograph is made of gauzy, "see through," material. Her skirt does not appear to be supported by hoops.
This looks like a pre-cage crinoline dress using flounces and petticoats to obtain fullness. The fan bodice was popular throughout the crinoline era. Her sleeves are wonderfully complex.
Keywords: 1859, Hanfstaengl, Elisabeth of Bavaria, Sissi, Sisi, Wittelsbach family, Habsburg family, Empress, Austrian, straight coiffure, round neckline, long close sleeves, ruffles, vee waistline, bows, full skirt, flounces