One of the ways to make an upholstery job look great is to have the fabric on straight. You also need to have the patterns line up, especially stripes. Here’s the best way to do that. On the frame, find the center of the front and back and mark with a pencil or chalk. Now on the fabric, do the same: Find the center of the front and back and mark with a piece of chalk. Notice I didn’t say pencil. If you mark the fabric in the wrong place, pencil will not come out. Chalk, you simply brush or blow it off and mark it in the correct place. As an upholsterer, I live by the center line!