The costume had to be warm, because it often snows in Colorado on Halloween. And we didn't want to have to paint too much of her body, because of the expense of the paint and because it gets itchy.
We started with a second hand choir robe as the base. Angel wings and werewolf teeth from a costume shop. Krylon "make it stone" paint in "black granite" (grey for the robe) and "obsidian" (black for the wings).