How to work with the nap:
First decide which side of the fabric must be at the top end. The nap must run from left to right. If you slide your fingers against the nap (from right to left) and it makes a ‘bruise’ on the fabric, you know it is correct. Now mark the top end and lie the fabric on a flat table that has a perfect square or rectangular shape. Bring the corner of the fabric in line with the corner of the table and make sure the nap lines are in line with the table edge.