Oilskin
Part of speech: noun
Definition: 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. Foul-weather gear worn by sailors, whether of natural or synthetic materials.
Slicker
Part of speech: adjective
Definition: Slippery or smooth due to a covering of liquid; often used to describe appearances.
Part of speech: noun
Definition: A waterproof coat or jacket.A person who is perceived as clever, urbane and possibly disreputable. (abbreviation of city slicker.)