Slicker fabric is a type of fabric that is waterproof and windproof. It is often used to make raincoats, jackets, and other outerwear. The term 'slicker fabric' is derived from the word 'OILSKIN', which is a seven-letter word used to describe a type of fabric that has been treated with oil or wax to make it waterproof. OILSKIN fabric is commonly used in sailing and fishing gear, as well as in outdoor apparel.