noun
nightclothes; sleepwear; pajamas; nightgown
General noun for clothes worn in bed or while sleeping. It can refer to pajamas, a nightgown, or other sleepwear, depending on the garment.
寒いので厚手の寝間着を着た。
It was cold, so I put on thick sleepwear.
旅行かばん
I packed pajamas in my travel bag.