oilskin

Cloth made from cotton and treated with oil and pigment to make it waterproof.

A raincoat made from cotton fabric treated with oil and pigment to make it waterproof.

I noticed Larry to-day had on two vests, two coats, and an overcoat with his oilskin outside of that.

He was preparing to venture out again, when Gaskin opened a locker and brought out an oilskin. “Hit'll 'elp you keep dry, sir,” holding up the garment.

Foul-weather gear worn by sailors, whether of natural or synthetic materials.