Overcoat/ˈəʊvərkəʊt/ Definition 1 of 2Pro Tip 1/3Cold Weather An overcoat is specifically designed for cold climates or seasons. You'll need an overcoat for the winter trip to Canada. Pro Tip 2/3Outer Layer Worn as the outermost garment, it covers other clothes. She wore her overcoat over a dress and a cardigan. Pro Tip 3/3Style Indicator Overcoats can be a fashion statement, varying in length, color, and material. His camel-colored overcoat complemented his outfit.