Making a Kate Middleton Barbie Wedding Dress Part 3Explaining what nap is and why it is important to know it. There is a line on the fabric that can tell you the nap, but why you shouldn’t cut on it. Good fabric stores will fold fabric with the nap. You have to be careful pinning the delicate pattern to fabric. What “cut on fold” means. You need to keep pattern smooth for obvious reasons. How to conserve fabric while cutting. Why pinwheels (not probably the official name of the tool) became unpopular–they are a metal wheel with sharp edges that