oilskin

oilskin
n
(a) [C, U] (coat, etc made of) cloth treated with oil to make it waterproof 防水油布; 防水衣.
(b) oilskins [pl]
suit of clothes made of this material 防水衣裤
    Sailors wear oilskins in stormy weather. 水手遇到暴风雨天气都穿著防水服.

牛津英汉双解词典