Ewwww! Look at this photo; beautiful new FJ Icons, nice stylish pants, and black socks? What the heck... This guys should have Garanimals for crying out loud!
Seriously, with these pants and shoes, I would have some nice dark brown socks that would more closely match the trousers and brown in the shoe. Khaki is probably too light, and white, even the low cuts, would be too bright. I also get the sense that this player does not like the low cuts, so having brown is the best alternative.