Quote Originally Posted by Claire Hallman View Post
The edges can stretch and the center end up being smaller. If you make the borders the size of the stretched edges it will continue to get bigger and end up with wavy edges/borders.
I use the border fabric strip themselves and cut to the same size as the center then ease the edges putting the larger one against the feed dogs while being sewn. So far no wavy edges and fairly square quilts.
Also, sometimes one side will be slightly (or more) longer than the other. By measuring through the middle and easing in if necessary your quilt will be more square.