I am making a whole cloth quilt for my daughter. The top is Tricot (a nylon fabric that slips are made of). The width of this fabric is 108". I asked at the LQS, and the longarmer told me it didn't matter which way the width went. The quilt is going to be a twin size, just extra long, which is what my daughter wants. The backing is also 108" wide. I was able to get 2 yards of tricot and wondered if it matters on the backing which way it goes. Do I have to put the 108" width, which means I have to cut off extra on the sides, or can I make the width the length?