I think that one of the other problems with non-woven and fusible interfacing is that it will delaminate or disintegrate due to sweat, etc. I might be wrong...but in any case, I'd recommend following Barb's and Elsie's advice in TaOK.

I can't seem to find where Barb answered a question I had about sources for hair canvas...but she recommended this site: B. Black and Sons

She said she recommended heavy Hymo as an alternative to hair canvas. I bought some of the hymo...but also bought the hair cloth on this page: Interfacing Canvas

The hair cloth was slightly lighter weight than the heavy hymo, but it seemed to work well for me. I still have the hymo that I will use on my next kilt.