The fine-celled pool noodles are inert, and other than the test in the article – have been proven to be colorfast in aerospace applications. Still, if you have any concerns, cover with cotton or tissue as noted above. We have been using noodles to pad hangers for two years. They hold up especially well for heavy outerwear which collapsed batting covered hangers. Coats and capes may have more surrounding structure to support the seams than vestments, but the noodles provide a fairly wide curve for the shoulder seam. Plus you can easily carve a gentle end curve if needed.
