Seriously! If you iron them too much (a la 'every time you wash and dry them') eventually you'll start seeing the material around the seams pale out to a cloudy white. We have a LTSO here in HSV who, when we had the white shirts, was the sharpest lookin' one in the whole bunch. Now, her shirt looks all... weird. And tacky. Along every edge, every seam of the shirt (over the pockets, around the sleeves, over the shoulders, etc) there's a strip of cloudy white that just makes it look like her uniform is filthy.

She's not pleased.