buff

adj. Of a yellowish beige colour (buff envelope). n. 1 this colour. 2 (in comb.) Colloq. Enthusiast (railway buff). 3 velvety dull-yellow ox-leather. v. 1 polish (metal etc.). 2 make (leather) velvety.  in the buff colloq. Naked. [originally = buffalo, from french buffle]

n. A sort of leather, prepared from the skin of the buffalo, dressed with oil, like chamois; also, the skins of oxen, elks, and other animals, dressed in like manner.