Besides the US Navy tartan I just recently ordered from USAK, I just ordered the Grey Granite from them today. Both are casual models, but I will be wearing them at the true waist like a traditional kilt. I think the Grey Granite is an excellent choice for a universal tartan. It allows a lot of flexibility in the color of shirts and socks that you wear with it. I have a dark charcoal polo shirt and charcoal hose that should go great with this tartan. Other colors that would look good with it - black, dark blue, dark green, maroon, etc.

Darrell