Tartan kilts were ... often attached to an old fashioned cultural snobishness of "Do you have the right to wear that tartan?"
That's odd. I don't think I've ever met anyone who wears a kilt proclaim it is for Scots only. The only people I've heard say that are non-kilt wearers who might challenge your "right". Kilt wearers just say "Wear it proudly!"

Aldisimo, I agree. That skarong is just wrong...