From 1st-art-gallery.com-Pyotr-Fyodorovich-Sokolov-Portrait-Of-Countess-Sofia-Stepanovna-Shcherbatova-1798-1885,-1818.html.
Princess Scherbatova appears to be wearing a coat with upper puffed sleeves and an angled opening.
Keywords: 1818, Sokolov, Sofia Stepanovna Shcherbatova, Sofja Shcherbatova, Apraksin family, Scherbatov family, Princess, Russian, curly coiffure, floral ribboned lace cap, high neckline, lace neckline ruff, coat, upper puffed sleeves, belt, close skirt