Apologies to whomever this is old news to, but I just stumbled onto this incredible website.

http://www.kiltmakers.com/kiltstobuy.asp

It doesn't just show tartans. It shows swatches from a lot of mills that make the tartan fabric you're looking for AND it shows the fabric weight!

While I'm sure Kiltmakers would hope you'd order their kilt from them, the site sure is an easy way to locate the tartan you want in the weight you want and know the mill that makes it when you order up from your own kiltmaker.

Never seen so much info combined on one site.

Ron