Rev,

The Scottish Lion has the Clergy ancient, and Clergy green ancient tartans:

http://www.scottishlion.com/customkilts.html

Here's another place that has both of the tartans:

http://www.scottishclansman.com/Formalkilt.html

Hope that helps. I thought about getting one in modern clergy, but that tartan seems harder to find for some reason.

Rufus