パンツ一いち枚まい

expression

wearing nothing but underpants

Describes a state of undress where the person is wearing only a single pair of underpants, often used in casual or humorous contexts.

• 朝あさ起おきたら、彼かれはパンツ一いち枚まいでリビングにいた。

  When I woke up in the morning, he was in the living room wearing nothing but his underpants.

• パンツ一いち枚まいで外そとに出でるのはやめてください。

  Please don't go outside in just your underpants.