- In Asia both women and men have always worn pants for warmth, comfort, and convenience. In Rome and Greece women and men wore tunics.
- In the fourth century, women in the Western world wore pants, which they adapted from the Persians. At that time, pants were considered unmanly.
- By the Middle Ages in Europe women were wearing dresses and men were wearing breeches.
- After the French Revolution, men took off their high heels, silk stockings, and wigs and began wearing trousers.
- In the nineteenth century women put on trousers to ride horses, but they hid them by wearing full skirts on top.
- All trousers were pull-ons until the nineteenth century, when front closures using buttons were introduced.
- Jeans were the first trousers to put women and men on equal terms.
- Until 1970 it was not fashionable and sometimes against the law to wear pants in offices, classrooms, and restaurants in the U.S.
Disclaimer: haven't double-checked this any. Just posting it for fun/general interest. Corrections/clarifications welcome.