「一丝不挂」英文怎么说？

birthday suit

赤裸，裸体，一丝不挂

George embarrassed his sister by answering the door in his birthday suit. 

George光着身子就去开门了，这让他的妹妹很尴尬。

Guess what she was wearing ? Her birthday suit !

你猜她当时穿着什么 ？ 她什么都没穿呀 ！