1860-65, peignoir [wrapper], American. The Met, C.I.60.11.1. [I love the lines of this one, with the angled strips of trim instead of the more common up-and-down strips on the center front. Also the bands on the sleeves and wrists. This wrapper is cotton, too; I hazard a guess that it has yellowed over the years.
Dress from "Sarah Polk, First Lady of Style" exhibit; Columbia, TN. The exhibit states "In 1847, she ordered the blue silk "robe de chambre" ("morning gown" from Madame Oudot Manoury, one of the most fashionable couturiers in Paris, France. The "robe de chambre" is like a modern bathrobe, quilted inside for warmth and opening down the front. It was an appropriate "undress" costume for receiving morning visitors. We do not know what she wore underneath (a day dress is suggested here)."