As a McGregor, you got my attention. I hadn't really concerned myself with this issue. Anyway, I read the Lord Lyon as saying the chief has the authority to do something about it. I'm not sure what that would be in terms of court and there's no indication that the Chief is going to do anything.
I guess mine is the last one on his list. I've outgrown it but I'm proud to have worn it.
My next McGregor will be the "film" tartan. I like it and I think it has done more for McGregors than anything else in recent history (Ewan aside). I read the movie designers reasons for that kilt and I believe it has as much authenticity as any other presented. (If somebody kept a copy of that, it would be great to see it reposted.)

All respect to the Chief, but when he sees fit to challenge the other tartans in court, I'll reconsider my position.

McGregor: despite them.