I agree with the other ladies, make the seams flat, but remember you are dealing with bias and it will stretch if you are not careful to press not scrub on those seams while flattening them. Also, the fabric could be your problem. Use a good quality soft fabric. It your fabric is as stiff as a board before you begin, that is the wrong choice. While making your seam, take the true bias path to sew on. If you get off, it does make a difference when you turn it around to use it.
I hope some of this rings a bell and helps a little.
Last edited by RedGarnet222; 03-18-2015 at 08:25 AM.