From Wikimedia; enlarged one half.
Natalia is dressed in the height of pre-revolutionary fashion with a bouffant coiffure and, possibly, a sheath dress.
Keywords: 1789, Voille, Natalia von Buxhoevden, Наталья Александровна Буксгевден, Natalia Alekseeva, Orlov-Romanov family, von Buxhoevden family, Countess, Lady-in-Waiting, Elizabeth Alexeievna, Russian, curly bouffant coiffure, ribbon headdress, fitted bodice, U-décolletage, lace modesty piece-bertha, lace bertha, tight sleeves, lace cuffs, waist band