I needed quite a while to consider this carefully.
I, too, think that a "Made in Scotland" label or "Scottish Kilt" category would be marvelous*. But, in reality, as posted above, the people selling inferior product will continue to do so. They will either blatantly lie and include the label, or they will find a legal end-run around the intent of the label.
Either way, I think the end result would be to lower the confidence of the buying public so they would no longer perceive the label as "a good thing".
You are better off in Scotland having people know the "real" providers of kilts provide quality product, and the inferior providers don't. Labels will not change the situation, and can only hurt Scotland if both products end up with the same label.
* note: the word "marvelous" was chosen specifically. I would truly find it a marvel if an acceptable to Mr. Hawthorne definition of a Scots Kilt could be created.
Bookmarks