Quote Originally Posted by Galant
A question then, what exactly does 'clergy' refer to? A particular denomination - C of E, C of S?

Or is just a reference to those in the full time service of God no matter denomination?
'Clergy' means that one has been ordained (or the equivalent) as a professional minister (priest, rabbi, etc.) of one's religious faith. Full-time has nothing to do with it, neither does one's denomination -- it doesn't refer only to Christian ministers, either.

I guess the question of ordination should be the dividing line between who should or should not wear the clergy tartan. It is a symbol of that commitment. So, now that I've thought it over, I think it should be reserved for those who have taken that step.