The BDUs we wore in Nam had buttons on the fly, and it was no big deal once you were used to it. I wore 501 Shrink to Fit Levi's back then too. I have been told the current BDU has velcro for all the fasteners. That would really bite. 
I simply love "over the fence moments".I used to wear them in the 70's. They were cool. I had more control then. I'd hate to have one of my older guy "gotta' go now" moments with them. Now I like sweatpants and shorts with elastic so I can have quick over the fence moments.![]()
I agree. If you're wearing basic jeans and the zipper is cheap the zipper can bunch. I've tossed jeans on account of this. Plus, if you don't wear panties all the time and you're not completely bare then the zipper for a lady can indeed pose a problem as it does for men.I like them. They look much better than a zipped fly.
One advantage I can think of is that there is almost no chance of accidentally flying low as doing up the buttons is a process you can't really forget.
. Plus, if you don't wear panties all the time and you're not completely bare then the zipper for a lady can indeed pose a problem as it does for men.![]()
(Yes, that actually happened t me once).