Just had this pop up on my Facebook......
https://www.frostriver.com/frost-river-sustainability-canvas/
Which links to this:
http://www.traditiontextiles.com/fabric.htm#
Don't know if it would be cost prohibitive to get it from the States but no harm in asking.
\I will indeed
I'm also going to see if I can get a sample from profabrics to see if their khaki matches up - doesn't have to be perfect