From Google search; removed spots with Photoshop.
Archduchess Maria Karolina wears a very a conical crinoline and pagoda sleeves. This could be a princess cut dress.
Keywords: Archduchess Maria Karolina of Austria-Teschen, Marie Karoline von Österreich-Teschen, Maria Karoline Luise Christine, Erzherzogin von Österreich, Archduchess, Austrian, long straight coiffure, lace-trimmed bonnet, bows, liner, over-dress, lapels, three quarter length pagoda over-sleeves, long under-sleeves, bracelets, under-dress, buttons, crinoline, maxi-length under-skirt