一丝不挂 naked
Explanation
一丝不挂，原指佛教用语，形容人毫无牵挂，后来用来形容人赤身裸体。
Sī bù guà, originally a Buddhist term, describes a person without any worries. Later, it was used to describe a person who is naked.
Origin Story
从前，有一个穷苦的农民叫张三，他生活十分贫困，常常衣衫褴褛，有时甚至连一件像样的衣服都没有。有一天，张三到集市上卖菜，正好遇上了一位富商，富商见张三穿着破烂，便嘲笑他：“你这人怎么这么穷，连一件像样的衣服都没有？”张三听了，尴尬地笑了笑说：“我本来是想穿衣服的，可是我连买衣服的钱都没有啊。”富商听了，哈哈大笑，指着张三说：“你真是太可怜了，一丝不挂的，连一件衣服都买不起。”张三听了，羞愧地低下头，他心想：我虽然穷，但我也不想一丝不挂啊。
Once upon a time, there was a poor farmer named Zhang San who lived a very impoverished life. He was often dressed in rags and sometimes didn't even have a decent piece of clothing. One day, Zhang San went to the market to sell vegetables and happened to meet a wealthy merchant. The merchant saw Zhang San dressed in tatters and mocked him,
Usage
这个成语主要用来形容人赤身裸体，通常用于讽刺或贬义，有时也用于强调人的贫困或无助。
This idiom is mainly used to describe a person who is naked, usually in a sarcastic or derogatory way. Sometimes it is also used to emphasize a person's poverty or helplessness.
Examples
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他浑身上下没有穿一件衣服，一丝不挂地站在那里。
ta hun shen shang xia mei you chuan yi jian yi fu, yi si bu gua de zhan zai na li.
He stood there naked, without a single piece of clothing on.
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她为了救孩子，一丝不挂地跳进了冰冷的河水里。
ta wei le jiu hai zi, yi si bu gua de tiao jin le bing leng de he shui li.
She jumped into the icy river naked to save the child.