Armor upgrades and experience?

[Re Berengario I]

Sincerely increasing armor with experience wouldn't make any sense, new armours won't grow out of nothing just because you fought a lot, you need an armourer able to build them and money needeed to buy them.

To add to the above ALREADY experience influences combat stats (as it should logically be):
experience 1: no effect
experience 2-3: +1 attack, +1 defence
experience 4-6: +2 attack, +2 defence
experience 7+: +3 attack, +3 defence

All in all the system works well, the more your troop are experienced, the harder they are to kill because of the higher defence and the more they are lethal against enemies (alas they fight better because they know how to do it not because they magically acquired new armours and weapons).