Joann's also carries the plastic by they yard in the upholstery section. Insteady of the the plastic canvas you can use the Deco bond which is also carried by both places. Walmart is usually the best price on that unless you are using a coupon at Joann's. Decor bond is also washable and to get the same stiffness you can iron it onto the main fabric and the lining. Use a denim needle when sewing it.