birthday suit
Pluralbirthday suits
- 1Nakedness: a person's bare, unclothed body, with nothing at all worn over the skin.
A streaker in his birthday suit dashed across the outfield during the seventh inning.
The resort has a secluded cove where guests can sunbathe in their birthday suits.
Note
A tailoring joke: the only suit anyone wears at birth is bare skin. Writers have enjoyed spinning it out, in 1842 Thomas Hood's New Monthly Magazine pictured Nature as "the universal tailor," fitting every animal but man with a birthday suit. It usually comes as in one's birthday suit and keeps its playful tone, so it suits teasing and light stories rather than clinical talk about nudity.
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Origin
From the lack of clothes one wears at birth.