Oilskin is like a special coat that keeps you dry when it rains. The coat is made from a special fabric that has been treated with oil to make it waterproof. Just like how water rolls off of a duck's feathers and they stay dry, the oil makes the coat so water can’t get through. Plus, the oil also makes the coat tougher, so it lasts a long time. People who work outside in the rain, like fishermen and sailors, wear oilskin coats to stay dry and warm. So, if you want to stay dry and cozy when it rains, an oilskin coat is the way to go!