Okay, no expert here, and I am known to push the envelope at times, but something subdued like the Holyrood tartan or even a saffron solid or forest green solid might be better. That being said, many say that tartan should be considered neutral, like blue jeans, so if you have the confidence, just do it. I didn't like the pairing with the 'Blackwatch' tartan but perhaps something like the Ozzie tartan would work. Don't be dissuaded, there is a combination that will work...get familiar with Photoshop, and good luck.
Rondo