Because one isn't required in our current system. A job is required to function. Workers rights in general are an everyone issue. The bread and circus of sports or competitions are the respective participants issues.
Considering that males have bits hanging and woman don't. Why haven't we tried taking back the skirt? It just makes more sense. Sure pants have the space but damn if that lack of material doesn't make it easier to spread out. Iirc didn't it swap around that woman used to wear trousers?