smoking cap
round, brimless man's cap, often with a tassel, worn in the 19th century as an informal at-home cap
en-GB/ˈsməʊkɪŋ ˈkæp/
en-US/smɑˈkiŋ ˈkæp/
round, brimless man's cap, often with a tassel, worn in the 19th century as an informal at-home cap