What is "robe-de-chambre"?

Robe-de-chambre is a French term for a garment that is worn over other clothing in order to protect it, usually while at home or in a dressing room. It is typically a loose-fitting, lightweight garment that may be made of cotton, silk, or another breathable fabric. It can be worn by both men and women and may have a variety of features, such as pockets, a belt or tie to keep it closed, and different styles of collar or neckline. The term "robe-de-chambre" can refer to a specific type of garment, or can be used more broadly to describe any type of loungewear worn at home.