A sports jacket is a type of outerwear that is typically worn for casual occasions. The two most common types of sports jackets are blazers and reefers. A BLAZER is a type of jacket that is usually made from wool or cotton and has a single row of buttons down the front. It is often worn with a shirt and tie. A REEFER is a type of jacket that is usually made from heavy wool and has a double-breasted closure. It is often worn with a sweater or vest. Both blazers and reefers are popular choices for sports jackets.