ˈ ̷ ̷ˌ ̷ ̷ noun
: an informal garment for wear around the house: as
a. : a woman's one-piece usually long-skirted garment that has a front closing and is similar in cut to a dressing gown or negligee
wearing … an emerald-green taffeta housecoat — Edmund Wilson
b. : a man's lounging coat or jacket usually of fine material (as silk or velvet) — compare smoking jacket