Buckskin
the dressed hide of a deer. The American Indians were expert in dressing the skin, especially of the Virginia red deer. The green hide was stretched by poles, cleaned of fat and flesh and rubbed with the brains of the deer itself. Buckskin was used for moccasins, leggings, and other articles of clothing not only by the Indians, but by the early settlers as well. The provincial troops were sometimes called "buckskins" on account of their clothing, a custom to which Burns refers humorously in a poem on the American Revolution:
Cornwallis fought as lang's he dought, An did the Buckskins claw, man.
Volume I · Aiton’s Encyclopedia