The term 'suit jacket' is a type of COAT that is typically worn as part of a suit. It is usually made from a heavier fabric than other types of coats and is designed to be worn with matching trousers. The crossword solution for the term 'suit jacket' is 'COAT', which is a four-letter word. A COAT is an outer garment that is typically worn over other clothing to provide warmth and protection from the elements.