Source : Webster's Revised Unabridged Dictionary (1913)

Kersey \Ker"sey\, n.; pl. {Kerseys}. [Prob. from the town of
   Kersey in Suffolk, Eng.]
   A kind of coarse, woolen cloth, usually ribbed, woven from
   wool of long staple.

Kerseys \Ker"seys\, n. pl.
   Varieties of kersey; also, trousers made of kersey.