Okay, the title is absurd, but bear with me...
I've long had this idea of creating a fantasy setting (for a GURPS game, a story or something...) that wouldn't be modelled after the medieval Europe (as many fantasy settings are), but after cultures like ancient Rome, Greece, Babylonia etc. While trying to decipher what separates these cultures from the Middle Age Europe, I've noticed something:
In none of these cultures people were wearing pants.
And now... many these cultures are, more or less, the roots of the modern Western society. European culture has, more or less, grown from the culture of Rome and Greece, with Israel-descended religion. And again, the people of Rome, Greece and Israel were not wearing pants, but pantless robes / tunics / togas. Keeping that in mind, how come we're not wearing these kinds of clothes today?