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nightwear 
Articles for indoor wear, some of which are worn for sleeping.
negligee
Light elegant women’s garment, usually long and décolleté with soft lines; it often comes with a nightgown of the same fabric.
pajamas
Light full outfit made up of a jacket or tunic and pants with an elasticized or drawstring waist.
bathrobe
Full straight garment with a belt; it is usually made of terry cloth and is worn after a bath or a shower.
