运动服用英语怎么说?是Sport clothes,还是Sports clothes?要是不用sportswear，非得从

运动服用英语怎么说?
是Sport clothes,还是Sports clothes?
要是不用sportswear，非得从那两个中选呢？ 如下题：We’ll have PE this afternoon but I forgot to bring my～.
A．sports clothes B．sport clothes C．clothes of sports D．sport’s clothes