field jacket

noun2

1. •
   A military or military-style jacket made of fabric (wool or cotton).

   • The morning was raw, yet he wore only summer khaki trousers, a light Army field jacket and, of all things, tennis shoes. He was shivering. — 1944
2. •
   A covering used by paleontologists to protect fossils, usually made of plaster and burlap.

   • Similar to a cast a doctor wraps around a broken leg, a field jacket keeps fossils from moving or breaking and protects them during transport. — 1999