I don't wear flashes. When I'm kilted it's with old fashioned soft gillies. The string runs up my legs (wrapped around of course) and hangs down where I've tied it. Sometimes I wear hose and sometimes I wear wraps around my calves.

Side note: I've got a leather strap I buckle around the top of my calf under hose or wrap to hold the scabbard on my sgian so it doesn't fall out. It's a good sgian and I'd rather not lose it.