I read a double heddle bookmark article that slightly mentioned and displayed an iridescent fabric. The author, Syne Mitchell, had used a red warp with blue-green weft. Red and green are opposite on the color wheel. Do you think that is what created the iridescence?
author: Syne Mitchell
If you choose a weft that is a radically different color than the warp (in this example a dark red weft on a green/blue warp) you may find that the finished cloth shows iridescence, changing color when you move the cloth or alter your viewing angle.