noun
nightdress; nightgown
A loose dress worn for sleeping, typically by women. The English loanword is used in Japanese with the same meaning.
彼女は新しいナイトドレスを着て寝た。
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.
Borrowed from English 'nightdress'.