A jacket is a mid-stomach–length garment for the upper body. A jacket typically has sleeves, and fastens in the front or slightly on the side. A jacket is generally lighter, tighter-fitting, and less insulating than a coat, which is outerwear. Some jackets are fashionable, while others serve as protective clothing. Jackets without sleeves are vests.
The word jacket comes from the French word jaquette. The term comes from the Middle French noun jaquet, which refers to a small or lightweight tunic. In Modern French, jaquette is synonymous with jacket. Speakers of American English sometimes informally use the words jacket and coat interchangeably.
Blazer, similar to but more casual than a suit jacket; single- or double-breasted of sturdy material, commonly with metal buttons.
Field jacket, a jacket that is worn by soldiers on the battlefield or doing duties in cold weather. The field jacket came about during World War II with the US Army introducing the M-1941 and the M-1943 field jacket and issued the jacket to their troops. The most well-known and the most popular type of military field jacket that is on the market today is the M-1965 or M-65 field jacket which came into US military service in 1965.
Sport coat (US) or Sports jacket (UK), a tailored jacket, similar in cut to a suit coat but more utilitarian, originally casual wear for hunting, riding, and other outdoor sports; specific types include a shooting jacket and hacking jacket.
Tunic, a thigh length coat or jacket worn with a wide range of military and civilian uniforms.
Jean jacket or denim jacket, a jacket falling slightly below the waist, usually of denim, with buttoned band cuffs like a shirt and a waistband that can be adjusted by means of buttons. Also called Levi's jacket (see Levi's).
Kilt jacket, one of several styles of traditional Scottish jacket worn with the kilt, including the Argyll jacket, the Prince Charlie jacket, and a type of tweed jacket.