From Wikimedia.
Aniela wears a very sheer over-dress with buttoned sleeves over her dress cinched with a waist band for her 1802 Vigée-Lebrun portrait.
Keywords: 1802, Vigée-Lebrun, Aniela Czartoryska, Radzieill family, Czartoryski family, Polish, curly coiffure, bun, over-dress, scoop neckline, quarter length notched sleeves, buttons, waist band, bows, under-dress, Empire waistline, close skirt