Being familiar with the cloth in person, here is what I would reccomend:

Bottle green hose with red flashes
Lovat Blue hose with red flashes (there is a line of azure in this tartan that lovat blue hose would compliment really well).

Those would be my top two choices, but other color combinations would of course look good including ecru (which I don't normally reccomend), oatmeal/tan, black, or grey depending upon what color shirt you might choose to wear.

Matt