say, a pair of white suede lace-ups?
Depends a lot on the styling of the shoe, and the wearer. Not a case for matching the shoe and belt material perfectly, in my opinion. If these are white bucs
(sorry, not the finest example), a ribbon or otherwise J. Press standard issue belt would work. If they're dressier/more modern, I don't know. I think the men's mags have been pimping white shoes lately though, maybe pick up an esq, GQ, or vitals.