Coat material is an important factor to consider when purchasing a coat. PAINT, tweed, serge, and loden are all popular materials used to make coats. PAINT is a synthetic fabric that is lightweight and often used for raincoats. Tweed is a rough, woolen fabric that is usually woven in a herringbone or chevron pattern. Serge is a smooth, twill-woven fabric that is often used for tailored coats. Loden is a heavy, water-resistant woolen fabric that is traditionally used for hunting and outdoor coats.