All I can think of is a suit of matching color, much like you see jay-z, p diddy and others in. I have seen a lot of younger guys wearing them with tux's and black suits but i don't think that's appropriate.
I bought this pair over the winter. I really have no clue how much I'll be wearing them, but I think they'll be fine with lighter colored linen trou, shirt, and sportcoat, or even just a polo shirt. But if you don't have a lighter tan, I'd get that first.
I am surprised nobody has mentioned white ducks or other white cotton trousers. I have four pairs of the latter, and often wear them in the summer in conjunction with one of my blazers or my cream-colored wool-silk-linen blend jacket and a pair of white bucks or spectators.
Great shoes. I'd do those with just about any summer look other than shorts or the ol' computer salesman (polo shirt and khakis). Certainly with any long sleeve BD or jacket, linen, or more refined cotton trousers.