From Longman Dictionary of Contemporary Englishten-gallon hatˌten-gallon ˈhat noun [countable] DCCa tall hat made of soft material with a wide brim, worn especially by cowboys
Examples from the Corpus
ten-gallon hat• Mildred Fender was in sequins with large feather earrings and a ten-gallon hat.• He sticks to his guns and, for that reason alone, deserves a tip of the ten-gallon hat.• He wore a white ten-gallon hat and black cowboy boots decorated with swastikas and stars. 