Ulster is a term that refers to a long, loose overcoat, usually made of heavy cloth and worn by men. Some synonyms for ulsters include greatcoats, topcoats, Chesterfields, and overcoats. Greatcoats are similar to ulsters in that they are long, heavy coats worn over other clothing. Topcoats, on the other hand, are shorter than ulsters and typically made of lighter materials. Chesterfields are similar to ulsters in length and style, but are typically made of wool or cashmere. Overcoats include any type of coat worn over other clothing and can vary in length and style. Regardless of the term used, these types of coats are perfect for keeping warm during cold weather.