Shamrock Show Daddy Hat - St. Patrick's Day Pimp Hat One size fits most. Approximately 20" circumference around inside of hat. The Shamrock Pimp Hat is the Perfect Touch of Irish Pride This Green Pimp Hat With Shamrock Print and Green Fuzzy Trim Makes a Bold Statement. This Hat Is a Lavish Expression of Irish Pride and a Bodacious Burst of High-Spirited Headwear. A Sure-Fire Head Turner on St. Patrick's Day.