Have Shamrock Style with St. Patrick's Day Party Hats! The St. Patrick's Day hat is the perfect touch of Irish pride. A simple St. Pats costume accessory that your guests will love. Approximately 22 1/2" circumference around inside of hat. One size fits most adults. Green felt top hat. Black elastic hatband with plastic gold buckle. Show your Shamrock Style with St. Patrick's Day Costume! Dress your guests in green and gold from head to toe with our St. Patrick's Day costume accessories. Greet your guests at the door with a stylish St. Patrick's Day hat, or give green and gold feather boas away as a party favor at your event. Part of Costumes > Hats & Wigs > Top Hats, Derbies, & Fedoras