sportswear I. \ˈ ̷ ̷ˌ ̷ ̷\noun (-s) : clothing suitable for wearing while engaged in an active sport (as tennis, golf, skiing) < a store specializing in sportswear > also: the wearing of such clothing or an occasion on which such clothing might suitably be worn < sell clothing for sportswear > II. noun : clothing designed for casual or informal wear