You get the nylon form most fabric stores, It is sold as lining material. It is thin and almosT invisble.
The biggest disadvantage to fabric hinges, is getting a clean hinge line due to paint build up. The I-beam wing hinge line has plenty of material to allow use of Dubro ot Klett type hinges. By using them you can do all the painting with the controL surfaces off the airplane, resulting in a cleaner line