What an important question to ask. Much of the time we just assume that it doesn’t or that if it does it’s not noticeable enough to matter at all. What we take for granted is the process of making a drapery treatment. In short a fabric manufacturer is taking a natural fiber such as cotton, or linen that is not symmetrical, doing their best to weave that into a squared fabric. At this point a manufacturer takes it, cuts it, serge's panels back together and then hangs it on a wall, planning on a 1/2" tolerance from perfection. That is no short order. Most of the time we get this process right, but those situations are working with normal, tightly woven fabrics. There are situations in which this is not the case and so we want to share with you some recent examples in which we came face to face with this exact scenario. We hope that the information will help you in the next situation that you encounter or are using a fabric that may stretch.