Here's a different thought, similar to Jock's post:
My father served in the US Navy. I did not. Because I honor and respect his (and others') service, I will not wear the US Navy tartan, because I didn't earn it. It's a handsome tartan which I really admire, but it's one that won't be in my closet. I'd feel like an impostor in it, because I did not sacrifice 4 years of my life to the service of my country.

If one chooses to wear a military tartan to honor someone else, then I applaud him and the one he's honoring. I'll honor military service by refraining from wearing the tartan. In the end, we're both honoring our fathers' service to something greater than themselves.