I feel a bit silly asking this, but I own a fab non-iron white button-down (from BR), and I don't get how to make the "non-iron" work. Will say, I wash mine and then dry it on a hanger, but it definitely needs ironing. Is a non-iron shirt meant to be tumble-dried; would that make it come out smooth and not requiring ironing? I don't throw any of my button-downs in the dryer but have always dried them on hangers (I line-dry most of my clothes), and then iron them, but of course I was quite drawn to the promise of "non-iron" so I'm tempted to try the dryer. Is that the right thing to do??