I have a 100% cotton raincoat (its decent, but not great quality, made by Penguin) that I just washed and it is now wrinkled. I was wondering if it is OK to iron cotton raincoats, or whether there was a special coating or something on the material that would make ironing not a good idea. I'm worried about shine. The tag says "warm iron" but I don't want to go ahead without consulting the Forum experts! Any idea? Better to steam, maybe?