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A tracksuit is an article of clothing consisting of two parts: trousers and a jacket usually with front zipper. It was originally intended for use in sports, mainly for athletes to wear over competition clothing (such as running shirt and shorts or a swimsuit) and to take off before competition. In modern times, it has become commonly worn in other contexts. The tracksuit was one of the earliest uses of synthetic fibers in sportswear.
Most tracksuits have a mesh interior which allows the user to wear them without any undergarment such as underwear. This is much like a bathing suit. Many people wear it for physical exercise sessions. A sauna suit is a specialized form of tracksuit made of a waterproof fabric such as coated nylon or