in your birthday suit

US /ɪn jʊər ˈbɜrθ.deɪ suːt/
UK /ɪn jʊər ˈbɜrθ.deɪ suːt/
"in your birthday suit" picture
1.

벌거벗은 채로, 알몸으로

naked; without any clothes on

:
He was caught running around the garden in his birthday suit.
그는 벌거벗은 채로 정원을 뛰어다니다 붙잡혔다.
She felt embarrassed to be seen in her birthday suit.
그녀는 벌거벗은 채로 보이는 것이 부끄러웠다.