Same thing I've been saying for a while now...find a tartan that means something to you, and wear it. That's really the only suggestion...it's not even a requirement, just a suggestion.

There are a few more 'restricted' tartans...and some that aren't even restricted, just not necessarily worn by people not directly associated with that tartan, like LEO Memorial, Leatherneck, and so forth. It's worth looking around.

-Sean