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The Collaborative International Dictionary
Sherryvallies

Sherryvallies \Sher"ry*val`lies\, n. pl. [Cf. Sp. zaraquelles wide breeches or overalls.] Trousers or overalls of thick cloth or leather, buttoned on the outside of each leg, and generally worn to protect other trousers when riding on horseback. [Local, U.S.]
--Bartlett.

Wiktionary
sherryvallies

n. (context historical English) Thick loose riding-trousers, fastened on the outside of each leg.