I had to use the only stuff I could find in Toronto for my first kilt as I had not read the appropriate threads that mentioned on-line sources. What I ended up with was described to me as Tailor's canvas, but it has a dense weave & it was like stitching armour plate. ( I ended up using needle-nose pliers & broke 3 needles before I was done.) They had 4 weights, so I picked the heaviest. (CDN$8 per metre.)

The colour should be cream. (Like the centre. Mixed light sources.)