Fetching details from the dictionary...

nightclothes; nightwear; sleepwear; pyjamas; pajamas; nightgown; nightdress
寝巻に着替えてゆっくり寝る準備をした。
I changed into pajamas and prepared for bed.
新しい寝巻を母に買ってもらいました。
I had new pajamas bought for me.
入院用の寝巻を持って病院に行った。
I took pajamas for my hospital stay.