While each armor type has its own advantages and disadvantages, there is a significant imbalance in the cost of brigandine compared to it's durability, and chain is slightly too expensive .
This mod makes slight changes to bring the cost efficiency of metal armours to similar levels.

Specifically Lamellar is boosted 10% durability,

Chain has its cost for a set lowered by 6 ingots and its durability increased 25%

Brig has its durability lowered 8% and its cost increased 54%

Note that lowering cost for chain has also lowered the cost for Plate and scale which use chain too.

The figures were balanced based on iron and may need some tweaking for other tiers, but using these small changes now the durability to cost for armours (iron tier) is between 29 and 33  whereas before it was from 20 - 50 durability per ingot for a full set.

Wood lamelar was also increased 25% which really doesnt make much difference but you might get one extra hit from a ram. Enjoy.

V 1.0.2 fixes bug in Brigandine, Buffs Improvised armour and slightly increases wood lamellar again

V 1.1.0 Adds Bone armor which is a minor upgrade over wooden lamellar.