Measure from top to bottom on each side and in the center to find out if the sides of the quilt are even. If they all measure the same you can cut a strip for each side and sew the on. Then measure across the top and across the bottom and once across the middle, same thing, if they are the same you can cut your top and bottom strips. Then sew those on. If they turn out to be different measurements you will have to square up the top to make the opposing side and top and bottom match. Apply a second strip all around in the same manner. Good Luck!