When your argument centered on the fact that one might where a military tartan or a pipe band tartan, you had me convinced. But then you mentioned there was an "official Scout tartan" which is NOT the same as the MacLaren tartan. I should think that since you are an associate member of Clan MacLaren, it would be understood that you may have full membership elsewhere (Clan MacKay). If you are going with the "I am not only a MacKay but also affiliated with this unit/band/scouting tradition, why are you not considering the official Scout tartan? (Just thought I'd ask...and have fun whatever you decide!)