Prestor John,

First, you may be interested in reading some information I have put together about the Clergy tartan here from my blog:
http://blog.albanach.org/2005/07/clergy-tartan.html

Second, off the top of my head, I know I can get the blue Clergy tartan in modern, ancient, and muted colors in a kilt weight cloth, but the only source of cloth for Clergy green I know of is in a tie-weight (much too light for a kilt). I can double check this when I get in to work this morning and can look through my various supplier's listings. I might find a source for you.

Barring that, I can always have cloth woven for you in whatever tartan you want. So if you want Clergy green, ancient colors, and no mill is weaving it, I can get it done. The cost of the fabric is $65 per yard, and it is single width (28" wide). It's heavy weight kilt cloth, really great stuff. My reccomendation, if you want to go this route, is to get a 4-yard kilt as opposed to an 8-yard kilt. Since the cloth is costing more, this will make the kilt more affordable. A 4-yard box pleated kilt would cost $480 (assuming hips under 46"). You can get more info here:
http://kilts.albanach.org/

I'll double check on that cloth later today for you. Email me if you are interested in more.
Aye,
Matt