oilskin

noun

1. a cotton fabric made waterproof by treatment with oil and used for rain gear and fishermen’s clothing.
2. a piece of this.
3. Often oilskins, a garment made of this, especially a long, full-cut raincoat or a loose-fitting suit of pants and jacket as worn by sailors for protection against rain.

noun

1. 1. a cotton fabric treated with oil and pigment to make it waterproof
   2. (as modifier)an oilskin hat
2. (often plural) a protective outer garment of this fabric