I bought 3 skirts, because I love the comfort, the fit and the fabric, but I cannot figure out how to get out the wrinkles! It comes folded in a bag, and, the wrinkles and folds are so set in, i can't get them out. I washed them, even tried the dryer, and still the folds are there. It says in the instructions, cool iron, but a cool iron doesn't do a thing. any advice?