The dress on the left can also be seen here and the dress on the right can also be seen here.
From fripperiesandfobs.tumblr.com-page-5.
All three dresses use shiny berthas (false berthas for two dresses) and sheer material for parts of the bodices. All three have decorated lower skirts and sleeves and wide shiny waist bands. The false bertha of the middle dress appears to be missing a pane.
Keywords: 1826, Zinaida Yussupova the elder, Zinaida Naryshkina, Countess de Chauveau, Marquise de Serres, Naryshkin family, Yussupov family, Russian,
(left dress): pelisse bodice, bateau neckline, paned over-bodice, quarter length full sleeves, cuffs, waist band, natural waistline, jeweled A-line maxi-length skirt, bows, floral skirt ornaments, passementerie
(middle dress): fitted bodice, off shoulder scoop neckline, pleated bertha, quarter length full sleeves, cuffs, waist band, natural waistline, A-line maxi-length skirt, passementerie
(right dress): fitted bodice, scoop neckline, paned over-bodice, quarter length full sleeves, cuffs, waist band, natural waistline, jeweled A-line maxi-length skirt, passementerie