Birthday suit
例子
He ran to answer the door before realizing he was still in his birthday suit.
他跑去开门，才意识到自己还穿着生日礼服。
The toddler escaped from the bath and dashed through the house in her birthday suit.
小孩从浴缸里逃了出来，穿着她的生日套装在房子里狂奔。
