Upgrade image posted 27 August 2017 from batguano.com/vigeeart17.html; removed spots with Photoshop and enlarged by half.
Panniers are no longer de rigueur? Oh well! They'll never be missed. Countess Skavronskaya wears a dress with a substantial, but unsupported, skirt and what may be just one under-garment that provides her modesty piece and cuffs. Maybe she wears an olive green under-garment conformal with a deep blue over-garment.
Keywords: 1790, Vigée-Lebrun, Jebulon, Engelhardt family, Skavronsky family, Countess, Italian, long straight coiffure, ribbon headdress, turban, veil, trapezoidal neckline, chemise, modesty piece, cuffs, under-dress, vee neckline, long tight sleeves, over-dress, quarter length close sleeves, waist band, natural waistline, full skirt, necklace, earrings