Sail Away with Your Halloween Costume Sailor Cap! Be a handsome hand on deck with this white sailor hat. This sailor hat is the perfect sailor costume accessory for navy, nautical, or sailing theme events. One size fits most adults. Approximately 21" circumference around inside of hat. Made of cotton. Spice up your sailor Halloween costume with a sailor party hat. The white sailor cap is a great addition to any sailor costume or navy themed event. Part of Costumes > Hats & Wigs > Novelty Hats