1851 Baronne Hottinguer (also called Bartholdy), née Caroline Delessert by Franz Xaver Winterhalter (auctioned by Sotheby's)
From Wikimedia; image lightened and enlarged by half by gogm.
The Baroness wears a pre-crinoline full-skirted evening dress that is indistinguishable from a crinoline evening dress in this 1851 Winterhalter portrait.
Keywords: 1851, Winterhalter, Baroness, Delessert family, Hottinguer family, French, straight coiffure, vee neckline, modesty piece, quarter length close sleeves, engageantes, wrap, lace, boa, fur, floral bodice ornament