No, this one.
All I know is the last time I was measured for pants, the guy had to move my eqpt to the left/right to get the right inseam length - I assume this had something to do with getting things to drape right, but have started to question it.
That is the way they measure pants, right?
The correct expression is, IIRC, On what side do you dress, sir?
The correct (or at least the funniest) answer? “Neither… I’m always prepared.”
Yeah… IN PRISON!
(can’t believe I’m the first one to get that!)
Wait a minute, we are suppose to use that button? I just thought it was there because clothing people don’t make any sense. I have discerned no appreciable use for that button.
How long have they been like that? Is it an annoyance that has only lately has decended to the cheap Saint Johns Bay stuff from Penney’s? I don’t remember it until recently.
I have beeen cutting the one button and flap off. So far, no diasters.
It’s the dickhole-flap button.
[Raising Arizona convenience store clerk]
Son, you got a button on your dickhole flap.
[/RAcsc]
Yeah, once a tailor and was fitting a suit for Benny Goodman. He asked him which side, because he needed to leave a little extra fabric there. Goodman said, “Leave some on both sides, because…I like to swing it!” 
Now people are going to mistake you for Jerry Seinfeld if you keep this type of thing up.
Go with the fall front thirteen button dress trousers instead. I do.