You can purchase fabric stiffener from craft store, for example: http://www.joann.com/joann/search/se...questid=294183
Or you can buy liquid starch from Walmart.
Or you can make your own liquid starch.
1. 1 tablespoon potato starch flour (better than the cornstarch) in 2.5 cups water.
2. mix the starch into a small amount of cold water, and while stirring to keep it from settling out, add boiling
water. The boiling water will cook the starch and turn it transparent.