(I'm sorry. I can't get the link posted properly. Copy/paste the entire link, including the two parenthesis at the end, into your browser.)
In the sermon, BY refers to those new pants that button up the front (Levi's) as "fornication pants", insinuating that the button-up fly was for the ease of prostitutes.
The sermon certainly is an interesting read. Brigham sure had a dirty mouth!
I'm tickled by the response of "Joseph Smith" over on the RfM thread. He says all his pants were fornication pants...
Here are my favorite jeans ever: Levi's Low Flare 542's. I have them in the medium wash pictured, and a dark wash, which are my favorite. They're not button-fly, though, thank goodness, so I'm safe! No fornication pants for me!

And Levi's jeans are the Only True Jeans for men. I know 'cause when they fit just right, my bosom heats up just a little. (Hey-- perhaps BY was on to something. Maybe they are fornication pants!)
KA