Look for the Hemp / recycled polyester twill. I know it's polyester, but it's at least recycled and attempts to be somewhat eco-friendly. I made a kilt out of this stuff and while it's not cheap, it is without a doubt the nicest stuff I have ever used to make a contemporary kilt out of.

http://www.hemptraders.com/product_i...roducts_id=281

That's the "natural" color...

Charcoal, very dark, almost black. I made my kilt out of this...

http://www.nearseanaturals.com/item.php?id=1542

It's also available in "indigo"...think, "blue jeans" and an olive drab.