Tracksuit
（重定向自Shellsuit）
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 as what athletes wore over competition clothing (such as running shirt and shorts or a swimsuit) and would 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.