This tip was done on the topic "Ode to Wonder Tape".
Another thing the wonder tape is good for is matching designs. Press under the edge of one piece of fabric, attach the tape right on the edge of the underside of the fold and press it in place on the right side of your second piece of fabric, matching as you press in place. Then unfold and stitch right on the fold line. Voila! A perfectly matched seam. This is great when making draperies with a design in the fabric.
The Wonder Tape can be removed after sewing the seam if you don't plan to wash the draperies. This tip can be used anywhere you are trying to match designs.