system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that in most cultures around the world men wear pants and women wear dresses/skirts?

I'm referring to older cultures (an those cultures who have traditional clothing) as pants has become a globally accepted piece of clothing for both genders to wear.
gpt
Horse back riding.  The horse has had a huge impact on our cultures.  There is more protection for the inside of your legs with pants than with a skirt.  Before we rode horses people in warm climates wore skirts regardless of gender.  In colder climates whole body suits made out of different furs were worn, creating something like pants, because it's essential to have a microclimate around your whole body to keep you warm.  A skirt dissipates heat by increasing the surface area and open air in the area around your legs.  

Men wore pants because they were the ones hunting and fighting, and using horses to do so.  Heals were also invented for men riding horses.  Later, women started to dress like men and started to wear heals and pants, and now you have women's fashion having directly evolved from male fashion.