I have tartan flashes for most of my kilts either because they came with them or I ordered them to match---these are the typical tartan with a notch cut tail in an inverted V. A few I ordered separately in a different style--shapped more like the traditional garter tie with a pair of straight tartan pieces with about an inch of squared off fringe. These I got off ebay. I also have about 5-6 pairs of solid colored flashes in the same frayed ribbon style, then some country hose that came with matching traditional garter ties.

I like to wear the tartan flashes (especially the ones with the fringing) when that is the only additional tartan I am wearing beside my kilt---no tie, plaid, tartan bonnet flash, etc... My preferences vary on a day by day basis and depending on what hose I am wearing.