From Wikimedia; spots removed with Photoshop and sepia tone removed.
Princess Joanna's pelisse bodice has a bateau neckline filled in with a high neckline insert edged with a ruff in this 1831 Sonntag portrait.
Keywords: 1831, Sonntag, Joanna Grudzińska, Jeanette Grudzińska, Princess Łowicz, Grudziński family, Romanov family, Countess, Princess, Russian, curly coiffure, knotted bun, partlet, high neckline, neckline ruff, bow tie, pelisse bodice, bateau neckline, epaulettes, lace ruffles, pufed sleeves