Blue Oyster mascot costume character dressed with a Henley Tee and Cummerbunds from our Oyster mascots. Let us help you bring your favorite characters to life. Come and discover our collection of costumes and accessories and make your next costume party an event to remember.. The Blue Oyster mascot costume character dressed with a Henley Tee and Cummerbunds will be perfect for your Oyster events. Many sizes available, premium quality, fully customisable with texts, logos, colors.