Actually I was just watching GGGoH, and when he collapses after Jonathon exposes him to the Kryptonite, he's wearing plain black socks under his dress pants.
Don't know if there's any other point in the series where we see them, just came across this one by accident smile

"It means never having to play it cool about how much you like something. It's basically a license to proudly emote on a somewhat childish level rather than behave like a supposed adult. Being a geek is extremely liberating."- Simon Pegg