At one time Mom worked with a group to make a queen sized Cathedral Window quilt for a raffle. (It was a state wide group with quite a few women working on the quilt but still a big job.) She had quite a lot of unbleached muslin. This is the 100% cotton Rangefinder muslin from Springmaid. She has it in both bleached and unbleached. It is permanent press. This is also priced by the 1/2 yard so if you wish to order 3 yards for a square quilt back you would use the quantity of 6.