John,

I would be careful to go to a shop that sells fabric for aircraft that
is traceable with lot and ID numbers as well as proof that it meets the
FAR's for fire resistance. Get all of this information logged in your
log books. If not you may have trouble getting through an annual. I
once had to do the FAR specified burn test to prove to my A&P that the
material we used was acceptable to put in the glider during a rebuild
on a Blanik L-13.

Tim