Clothing worn for sleeping; nightclothes or pajamas.
子どもの寝巻きを着替えさせてから寝かせた。
I changed the child's pajamas before putting them to bed.
夏は薄手の寝巻きで十分だ。
A lightweight set of nightclothes is enough in summer.
入院したので病院の寝巻きを着ることになった。
I was hospitalized, so I had to wear the hospital nightclothes.