The Wikipedia article for Count Marie Gabriel Florent Auguste de Choiseul-Gouffier is here. It makes no references to his family.
From Leon Wilnitsky; enlarged one fifth by gogm.
This undated portrait shows a fraise from the Napoléonic era and a bertha and dual upper puffed sleeves from the post-Napoléonic and Victorian periods.
Keywords: de Choiseul-Gouffier family, French, curly coiffure, ribboned lace bonnet, strap, bows, high enclosing neckline, neckline ruff, partlet, off shoulder scoop neckline, modesty piece, bertha, dual upper puffed sleeves, waist band, natural high waistline