We have a sun room that I have converted into my sewing room. There are 2 walls that are almost all window. They were never covered before, so I'm making some curtains. I purchased some sun block lining fabric and I have the drape fabric. This will be fine for warm months, but the windows are cold in the winter. I was wondering if I should just add a layer of batting between the fabric & lining and quilt it. Has anyone done this before? Anything I should be aware of? What type of batting should I use, poly, cotton, bamboo (i've heard bamboo drapes well). thanks for any info.