1. 一丝不挂;赤身裸体：Birth is much, but breeding is more. 教育重于门第. | Birthday suit 一丝不挂;赤身裸体 | bite off more than one can chew 贪多嚼不烂

2. 裸体：birth 出生 | birthday suit 裸体 | birthday 生日

3. 一丝不挂：bell the cat 甘冒风险 | birthday suit 一丝不挂 | born in the purple 出生于名门望族

4. 生日礼服(什么也不穿的意思)：Eye-opener 令人大开眼界的东西 | This birthday party is a real eye-opener. 这真是个叫人大开眼界的生日晚会. | Birthday suit 生日礼服(什么也不穿的意思)

noun

1. informal terms for nakedness

e.g. in the raw
in the altogether
in his birthday suit

Synonym: rawaltogether