I have heard a lot of guys wear oatmeal coloured hose. I guess it's just a very neutral colour. I haven't seen any in person, but it seems like a good way to go. Just coordinate well, and you should have no worries.
Black and off white just seem like natural choices to me, since they will go with about everything.
Take this with a grain of salt though, as I am still waiting for my kilt hose to arrive in the mail. Right now I am making do with low top boots, and pushed down socks