I’m fascinated by armor and therefore always curious about how cosplayers simulate the material. I’m constantly coming across new techniques. I’ve posted several times about how people use foam to make armor look like metal or leather — it and Worbla seem to be the most versatile materials — and though I’ve seen a fabric method before, Ruth Johnson uses fabric differently than what I’ve seen in the past. She created armor for her elven costume by covering cardboard with a textured silver fabric.
She wrote a tutorial based on the shoulder pauldron she made. She drafted the pattern on cardboard, used foam to add detailed accents, and simply cut and glued the fabric into place (when you cut the fabric, you should leave extra so you can fold it over the edges of the cardboard). See all the steps and get more details and photos at Ruth’s website.