A free mod for Mount & Blade II: Bannerlord, by Dr_Mikaeru.

With the RBM Unit Overhaul, you can experience a realistic combat experience. You can also get access to a Vlandian Armory patch for your game. This patch adds a few extra pieces of armor from Swahili armory, which i felt were period appropriate.

The RBM Unit Overhaul also brings in a new unit tree, which you can use to customize your troops with different traits and skills.

You can also get access to a couple optional files, which bring mail chausses to armorer shops in Vlandian towns.

Lastly, this is a Vlandian Armory patch for the RBM mod. It has a few extra armor pieces enabled from Swahili armory, which i felt were period appropriate.