I think Glenn likes how the black-and-white shoes are retro and individualistic - they're not just another pair of black shoes, but something different. I don't mind them, but then again, I'm not typically looking at his feet.
Lindsey Buckingham currently wears skinny jeans onstage and looks good in them, but they give you love handles and a gut unless you're super-thin. Too bad 'cause they sure look good on the butt.
Still I wouldn't recommend them for the guys. The fitted jeans, on the other hand, sound good.