Image from Wikimedia.
Ekaterina wears an evening dress with a elaborate and very full sleeves under her lace capelet in this 1838 Sabatier portrait. Her sleeves appear to have engageantes, but sheer over-sleeves continue down from the engageantes.
Keywords: 1838, Sabatier, Ekaterina Goncharova, Baroness van Heekeren, Goncharov family, d'Anethes family, Pushkin family, Baroness, Russian, Lady-in-Waiting, Alexandra Feodorovna (1798-1860), straight coiffure, wrap, lace, off shoulder vee neckline, bertha, engageantes, dual puffed sleeves, ruffles, vee waistline, full skirt