Plumbob, it is sold by the yard, and a yard of "piller tickin" will last you a loooong time in that .32....other calibers too, for that matter.
I don't recall what it costs, but it is only a couple of bucks per square yard.
Quite often you will find the material with red stripes and / or blue stripes...color shouldn't make much difference, although I have do have some red stripe that mic'ed an honest .018 after washing.....I haven't found ticking this thick since, even though I do look about every time I see the red stripes.
Don't be afraid to feel of it, or even measure the thickness if you have a micrometer or a caliper. If they should have two different bolts or different kinds, don't be afraid to compare 'em.
If you don't see pillow ticking, look for a good heavy, close knit, denim....it works just fine.
Stay away from 4Fg!....its primary use is priming for flintlocks...
Uncle Russ...