As a teen we went to this event, and my mom bought this belt. The canvas part measures 36.5" end-to-end (not counting buckle), but I have no idea what size the belt would be considered. Last picture is of the Tall Ships logo.
Parade of Ships -- USA Bicentennial -- NYC -- July 4, 1976 -- PUBLIC. The Parade of Ships celebrating America's 200th birthday. On New York City's Hudson River July 4th, 1976 part of Bicentennial celebrations.