When is the wedding? Have you cpnsidered diced hose?

If not diced, I'd go with claret hose as well. I prefer garter ties, so would wear a set of those in a complimentary color to the kilt for a splash of color. I would avoid black--but because there are so many other colors

If you have tartan flashes...wear those. they are fine. just roll them so less material shows (as previously noted, they are quite long).