buff jerkin

noun1

1. •
   (historical) A jacket made of buff leather, formerly worn beneath a soldier's armour.

   • Fal. Thou say'st true Lad: is not my Hostesse of the Tauerne a most sweet Wench? / Prin. As is the hony, my old Lad of the Castle: and is not a Buffe Ierkin a most sweet robe of durance? — 1597