surcingle
noun
sur·cin·gle ˈsər-ˌsiŋ-gəl 
1
: a belt, band, or girth passing around the body of a horse to bind a saddle or pack fast to the horse's back
2
archaic : the cincture of a cassock
Example Sentences
Recent Examples on the Web That came to light when a lowbrau burst into the ball pasture with several slugs of something under his surcingle slightly stronger than Hyson. 
Johnny Miller, San Francisco Chronicle, 28 Mar. 2018
Johnny Miller, San Francisco Chronicle, 28 Mar. 2018 Word History
Etymology
Middle English sursengle, from Anglo-French surcengle, from sur- + cengle girdle, from Latin cingulum — more at cingulum
First Known Use
14th century, in the meaning defined at sense 1