Sentence:  And so , after a flight southeast to Savannakhet , we found ourselves bouncing along in a Jeep right behind the Land-Rover of Prince Boun Oum of Champassak , a tall man of Churchillian mien in a bush jacket and a <WSD>ten-gallon</WSD> hat from Texas . 
Meaning of the word marked with <WSD> tags:  a hat with a wide brim and a soft crown; worn by American ranch hands