I looked through my 'The Complete Book of Tartan' which has quite a few of the more common tartans listed and couldn't find it there for sure. The guy whom I got it from is the husband of a costumer and she tends to accumulate fabrics the way black holes accumulate matter. I suspect it was acquired somewhere as a "good deal" with intent to use it someday for something, but was eventually culled and thus ended up in my hands. It'd be nice if it were some recognized tartan but as you mentioned it is a nice pattern and should look nice when made into a kilt regardless.