This sculpted one prim hat attaches to the mouth. It can easily be stretched in all three directions, so it's a lot easier to adjust to fit your personal needs than linked prim hats. Should you mess up the hat just set it to the default dimensions listed in the obect description. Since it's modify, copy you can tint it if you wish a different color.
You can see this hat in world at Urid Dal's Hat Shop in Sponsa (128, 128, 29) or follow the link to an image:
http://slexchange.com/modules.php?name=Marketplace&file=images&ItemID=716493