Well done, Todd! You managed to put into words exactly what I had been chasing around in the back of my mind. Based on when and where it was diesigned, it is understandable for one to assume it was meant for Christian clergy (and at the time it might have been). So are we going to go with what was probably the intended meaning, or the actual definition of clergy, which would include all faiths?

As for the original question, I think to wear it or not to wear it is up to you. All of the tartans I "wouldn't wear" (service branch, law enforcement, firefighter, etc.) out of repect, are fairly distinctive. To my mind most that seemed to recognize it at all would probably ask you if you're a Clark.
For the record, I'm a pastor, and one of my next couple of tartan kilts will be a clergy. :mrgreen: