[PvK]

A hauberk is an armored tunic (generally of chainmail outside of Dominions), and may or may not have sleeves of whatever length.

Q.v. merriam-webster.com, which adds about tunics, "a simple slip-on garment made with or without sleeves and usually knee-length or longer, belted at the waist, and worn as an under or outer garment by men and women of ancient Greece and Rome"

M-W gives Cuirass as, "a piece of armor covering the body from neck to waist; also : the breastplate of such a piece".

PvK