This is an interesting topic to me.I made a quilt with an appliqued border.I am sure it layed flat and was square before starting the applique.After applique was finished, it had a couple wavy borders.An experienced shop owner told me you must applique on borders Before you add them to the center,or the process of appliqueing will make the border length change.I never run across this idea,is it true?I havn't tried another time.