In the 1920s, menswear moved towards simplicity and casual styles. Men abandoned starched collars and formal three-piece suits in favor of softer collars and one- or two-button suit jackets often worn without waistcoats. Unique developments included Oxford bags, which were wide-legged trousers popular among students, and plus-fours, baggy knicker-style trousers with an extra four inches of material. Edward, Prince of Wales was influential with his fashionable yet casual style incorporating these new trends.