1790 Countess Ekaterina Vassilievna Skavronskaya, née Engelhardt in Naples by Élisabeth Louise Vigée-Lebrun (Musée Jacquemart-André - Paris France) Photo - Jebulon
From Wikimedia; some spots in background removed with Photoshop by gogm.
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