He says he spends most of his home-time in the buff.

他说大部分在家的时间，他都会只穿着这件“真皮外套”。

youdao

On the second, again he is in the buff, this time wearing JUST a black sweater.

另一张照片中，还是光溜溜的，只搭了件黑色毛衣在身上。

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On one cover, he's in the buff with just a black jacket draped over his shoulder.

某张照片中，他没穿衣服，只在肩上披了件黑色夹克外套。

youdao

In time, any man who rushed to fight a fire became known as a fire buff because of the buffalo coat he wore.

VOA: special.2009.05.17

Someone who is deeply interested in the American Civil War is a Civil War buff.

VOA: special.2009.05.17

Erick Williamson was having a cup of coffee in the buff one October morning.

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Actor turned up in several successful films last year, including Love in the Buff, An Inaccurate Memoir and White-Haired Witch.

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In the past, darting outside unclothed to, say, fetch the newspaper meant you ran the risk of the door shutting behind you, leaving you locked out in the buff.

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