Is this offensive or allowable?

[Alan H]

mate, seriously....if you refuse to wear anything that will offend someone, ever... you might as well go naked.

If you really, truly are concerned with not offending anyone, then there are about a bazillion non-clan tartans out there. Odds are fair to middlin that your State has a State tartan. I happen to dearly love the Holyrood tartan and that's not a clan tartan. My nicest kilt is in the Capercaillie, modern tartan and that's not a clan tartan, though it's "Scottish". How about the "Scottish National" tartan? The "Flower of Scotland" tartan? The list goes on and on and on.