habergeon

/ˈhæbərdʒən/
noun
  1. A short, sleeveless coat of chain mail armor, worn as a defensive garment in medieval times.
    • In the museum, we saw a habergeon that was over 500 years old.
    • The blacksmith carefully repaired the links of the damaged habergeon.
    • The knight wore a habergeon under his tunic for extra protection.