Quote Originally Posted by OC Richard View Post
It has me stumped too.

It has the simple look of many modern tartans (the purple line especially leads me that way) but there are hundreds on hundreds of those, fashion tartans and "Irish" tartans etc, too many for me to keep up with.

The first thing I was going to check was the USA Kilts tartan pages, for me the quickest way to visually search (by look instead of by name) through a vast number of tartans at a glance, but I'm getting "service temporarily down".
I've looked through both the USA Kilts and the St Kilda tartan finders to no avail. I have also googled images for Irish and Welsh tartans, with the same results. My best guess at this point would be that this is a fashion tartan.