ナイトドレスナイトドレスMeanings1nounnightdress; nightgownA loose dress worn for sleeping, typically by women. The English loanword is used in Japanese with the same meaning.彼かの女じょは新あたらしいナイトドレスを着きて寝ねた。She slept in her new nightdress.このナイトドレスはシルクでできている。This nightgown is made of silk.