Most of these kinds of specialty tartans aren't readily available from a Scottish Mill and are woven in batches for the people who order them (like the Riverside Pipe Band). So, your best bet is to contact the people who are currently wearing the tartan to find out where they either got the tartan or their kilts. If you find the tartan and decide to get it, just be sure that you ask what the weight is.

The scan of the tartan itself is beautiful, but it sure doesn't look much like the picture of the Riverside band kilts!

Barb