About the only advise that I'll give on flashes is to coordinate them with the tartan, the shirt, AND the kilt hose. There's nothing worse than dark kilt hose with dark flashes... in my eyes anyway. It looks "muddy", or heavy, and draws away from the beautiful kilt. I, personally, prefer to see flashes that accentuate the base color of the tartan whenever possible. The kilt hose, then, should accentuate the shirt. That way, the top and bottom draw attention to the middle. It works!