It's all because of those two rows of buttons (hell, dunno how it's possible for a guy to look hillarious, a bit stupid and sexy at the same time but they - I mean males of the era - acomplished this xD).
There was a "fly" style of breeches, designed a lot like our trousers of today, which had a flap that buttoned down the center and was hidden by a strip of fabric. XD Maybe next time, I'll draw one of those. XD
I'll be more than happy to see that xD And it's always nice to see old style fashion clothes 
) Yeah, I think I know the type of "fly" breeches you speak about xD (often I do think that our fashion today is so boring and modest when comparred to old style clothing).
) Yeah, I think I know the type of "fly" breeches you speak about xD (often I do think that our fashion today is so boring and modest when comparred to old style clothing).