From Wikipedia.
High coiffures, pleated bodices, wide belts/waist bands, and double sleeves with gauzy outer sleeves are hallmarks of late 20s fashion, as shown here. Countess Apraxina is not wearing an Apollo knot coiffure, but a braided bun framed by hurluberlu curls instead.
Keywords: 1827, Sokolov, Countess Sophia Bobrinsky, Samoilov family, Bobrinsky family, Countess, Rusian, hurluberlu coiffure, bun, scarf, off shoulder bateau neckline, pleated bodice, double upper puffed sleeves, cuffs, belt, A-line skirt, earrings, gloves