Create a sports clothesline

I'm creating a sports clothing brand (men and women, young adults) that provides products that have style, have modern designs and that have an outstanding quality for the user. I'm looking for a sports clothesline designer that can create new designs (shirts and shorts) for the following sports: Gym, Tenis and Running. The main goal is to create designs that provide a modern, stylish look for those young adults that love trainning and competition.