Lol.
Oh, pants were around for a long time before that, but were treated the way a**less chaps are treated now. Poetry written in Ancient Greece suggests that pants were ridiculed and viewed with contempt by the Greeks. You know, the guys who went around dressed in togas.

Even the Romans saw pants as barbaric. But then Henry VIII came along.
Funny, but fair warning: link goes to Cracked.com which isn't exactly known for using safe-for-work and family language...