From Longman Dictionary of Contemporary Englishnightgownnight‧gown /ˈnaɪtɡaʊn/ noun [countable] old-fashioned DCCa nightdress
Examples from the Corpus
nightgown• It was a nightgown case and his eyes lit up as he saw it.• She wore a nightgown, and her silvery hair streamed free over her shoulders.• By nightfall it was cold again, and she was grateful for a borrowed flannel nightgown.• Her frantic husband had gone to visit her and found the empty bed and her nightgown on the floor.• Alice had just come downstairs in her nightgown.• I could see the hem of her nightgown.• She throws her nightgown over the tube, like a white, tasselled theatre-curtain. 