Why women should wear shorter clothing than Men

I've captured this picture from a red line (subway) ad where the woman athlete is showing on running the marathon with shorter clothing where as the man has comparatively more clothes than the woman. My question is why this is like this - is there any conscious choice made by that woman athlete? Or is this happening involuntarily and with no intention of getting any benefit out of it?

I also see this similar images in the game of Swimming and Tennis; again my question remains the same - What's the purpose?

One argument women may make is that those clothings are attractive and women has this attractiveness in their physical appearance and they should use that asset just like Men show off their muscle or physical strength. I don't necessarily buy in to that argument as when you're in the game of a particular skill, your focus is to prove your strength in that skill set and nothing related to showing off physical attractiveness to attract other people in short, you're proving your excellence in the field say it's athletic sprint or swimming.

So there is something or some invisible establishment that is influencing women to choose shorter clothing even though it's entirely irrelevant.
I'll add more overtime on this discussion