I got a Colorado Rockies New Era Hat yesterday and it is to big on me. I got a 7 3/4 and I usually wear 7 1/2. I have no idea why I got 7 3/4 but I need to shrink it. I heard that you cannot shrink it because it is 100 percent polyester. I also heard if you damp the rim of the hat and blow dry the hat it will shrink. Any suggestions??