1. Use a ruler to mark diagonal lines on your cotton fabric. I made mine the same width as the ruler and as long as the fabric allowed.
3. Pin as shown in the photo. This is made easier if you make the line with a ruler first.
4. Sew. Flip so the wrong side is fabric is up and you have one long strip. Press seams open and iron.
5. Fold both edges in to meet in the cenre and iron. Your bias binding is now ready to use.