The way gear looting and selling works is unrealistic IMO. After and during battles local citizens and soldiers alike looted the mundane trinkets and weapons of the dead or injured. The Lords who had good control of their men would direct them to get the most valuable loot to claim themselves. random tattered gear etc. would be collected by the troops and effectively upgrade/replace their own worn gear.
It is unlikely a lord would show up at the nearest town after a battle with a dozen torn headwraps or whatever LOL. Nor would they be collecting bent pitchforks. That stuff would be turned to raw resource (fire wood, metal scrap) on site or re-processed by the troops for their own gear.
We should loot the following to our own inventory after battles-
A few if ANY HIGH END armor, weapon, horses etc. if we are gonna have damaged gear there should be a mechanic for repairing it. People wouldn't use damaged gear. They'd repair it or turn it in for scrap/repurposing.
(think about it 99% of gear in M&B is a useless grind. You chuck into inventory and chuck it into a sell screen alter. VERY dumb, unrealistic, unfun, uninteresting, boring, annoying, silly, GRIND GRIND GRIND...it's the worst part of the game)
Raw materials called METAL SCRAP and SCRAP WOOD. This wood and metal would be used for forging, troop upgrades and firewood would be used normally (should be a consumable that is required on hand and is used over time) etc. RAGS is also a possible resource. Basically the tattered bits of clothing and cloth etc. used for different purposes as a disposable resource.
Coin and Jewelry. Mostly what a lord or king would collect or demand from the field would be a share of the recovered coin and jewelry. Different cultures had different ways about it. Main point is a lord would assume a certain mount of coin or jewelry from any battle.
M&B gives us less or no loot when we take prisoners. This is nonsense. You would get the MOST valuables from taking people prisoner. You would strip them off everything without a chaotic battle. They would give these items up in exchange for their life/because they had no choice. In a battle who knows who loots the body before the battle ends and what happens to their loot as they are running around smashing their gear into your gear and vice versa. You should get undamaged weapons, clothing, weapons etc. from prisoners.