Bill - sounds just like 10oz, denim, my favourite.
You can rip denim into strips at about 1 3/8" wide, pull off the 'strings' of thread then the strip will end
up being about the right width, then cut the strips into squares with scissors.
Square works just the same as round. If you push one into the muzzle from a strip of cloth, then pull it out, it will be square with rounded corners.