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A shooting jacket is a type of sports coat worn, as the name suggests, originally in the sports of shooting or hunting. It usually comes with a leather patch on the front shoulder to prevent wear from the butt of a shotgun or rifle, frequently with matching leather patches on the elbow.
A hacking jacket is a wool sports coat for casual horseback riding, often of tweed and traditionally with a single vent.
A blazer is similar to a sports coat but more closely resembles a suit jacket, and is tailored from solid color or striped fabrics. Blazers are often made with metal buttons reflecting its origins in the sport of boating, though this is not necessarily a defining feature.