What would be the best color(s) for a surcingle belt to pair with blue & white seersucker when wearing white bucks?
I've avoided the dilemma when wearing the full suit by using suspenders or replacing the bucks with tan calfskin but I have a couple other pair of SS trousers I would wear separately, i.e. without tie & jacket, with the bucks if I had a proper belt.
Doesn't matter, as long as the tabs on the surcingle are tan.
It's casual dressing. I mean, the kind of very American look you're going for with bucks, seersucker, and surcingle can benefit from not being over-thought.
Though of course, navy with a red stripe is very classic. Obviously, anything with a red will work. I might not wear a solid in an autumnal color.