habergeon
noun
ha·ber·geon ˈha-bər-jən 
hə-ˈbər-jē-ən,
-jən 1
: a medieval jacket of mail shorter than a hauberk
2
: hauberk
Word History
Etymology
Middle English haubergeon, haberion "coat of mail worn under plate armor, hauberk," borrowed from Anglo-French haubergeon, haberjon (continental Old French hauberjon) from hauberc hauberk + -ion, diminutive suffix
First Known Use
14th century, in the meaning defined at sense 1