1. Make a heart pattern with paper and place it on the sweater to make sure you love the size and shape. 2. Once you've created the perfect pattern, use it to cut a heart out of your fabric. We used polyester fabric because it has some stretch and won't fray. 3. Simply pin it in place and sew it on using the zigzag stitch. 4. Wear your new sweater proudly. You did it!!