I'd like to find some lightweight tartan material that my wife can make a dress out of. She claims wool is way too hot, and I can't even convince her that PV is light enough.

I know there are lots of materials out there that are available in generic tartans or even "plaid" patterns. But we're looking for the Colquhoun (Ancient) tartan specifically.

Is there a source for material that's lighter than the 10-11 oz. PV material, that would offer a fairly uncommon tartan like Colquhoun?