in your birthday suit

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

tanpa busana, telanjang

naked; without any clothes on

:
He was caught running around the garden in his birthday suit.
Dia tertangkap berlarian di taman tanpa busana.
She felt embarrassed to be seen in her birthday suit.
Dia merasa malu terlihat tanpa busana.