Norbydog,

How far back have you traced your Morris line? Is it indeed "Morris" or "Morrison"? It may seem like splitting hairs to most, but generally if you're lines lead back to Morrison you're likely of Scottish or possibly Irish descent, whereas if it's "Morris" (without the "son") you're more than likely Welsh or yet again even Irish ("FitzMaurice" or "FitzMorris", et al).

Regardless, it's best that you decide what you wish to wear...that's all that truly matters. I don't mean to throw a wrench into the works; ultimately it's your decision on what tartan to wear. Best of luck to ya...you'll look smashing in most any tartan kilt I'm sure.