Here is the exclusive grey Vivienne Westwood mountain hat worn by the famous Pharrell Williams. This is one of about a half dozen colors that this exotic hat comes in. Not everyone can order one of every color, like Pharrell, but here is your chance to try on each of these hats right here on ViewTry.com. See if this hat fits you and if this is the Rock Star look you have been searching for. Try on this Vivienne Westwood grey hat right now on ViewTry.