I remember a few months ago Scotweb added the actual tartans from the movie Braveheart and Rob Roy. I popped in "braveheart" in the tartan search and got this

http://www.scotweb.co.uk/tartan/Brav...erm=braveheart

As for whether or not this would be suitable for a kilt, give Scotweb a dingle, i've always found them eager to help.