the trick to using unpuckering bias is to cut it wide enough to double over, match the raw edges, fold every few inches and pin because the problem comes in letting one side 'creep'... which is easy to do... so by folding STRAIGHT over and matching every few inches the two point straight across from one another will stay together...why bother? Because the bias threads that enclose the raw edge of the quilt sandwich criss cross each other over and over the whole length of each side, they wear far longer...we have all seen old quilts with the binding seams still in place, but with the edge completely worn away so the quilt layers, batting, and binding layers are all visible. that is because when that ONE thread that ran the length of the side began to wear, there was nothing to stop it going completely away. This edge receives the most wear and tear of any part of a quilt...you (and all your hard work) and the quilt both deserve the extra hassle of working with bias... many people think that bias is more expensive but it is NOT... the square inches of bias fabric are exactly the same as the square inches used of crossgrain fabric... it's just that you will have more seams... how much trouble is that really? 10 little seams instead of 3 or 4? try the pin technique and keep the edges even...see if you don't love the way it looks after a couple of practices...