I took SGMJanus's list of armor fixes and added more options. All of the non-plate (That is takes up both slots) leg armor is now added to brigandine status. I also changed the composite gloves light given they are mostly made of chainmail. 
Original Mod


Here is what I found for the armor type ids based on what I found to help other modders out. One thing I found is that Armor_Type 4 while it counts as chain for chainmail it does not count as chain for legs or gloves. So, I had to set them as Id 3.

You know there is actually type XML that I wasn't aware of that says what ID is what. 
      <row armor_type_id="1" armor_type_name="default cloth" equip_buff_id="" />
      <row armor_type_id="2" armor_type_name="light leather" equip_buff_id="" />
      <row armor_type_id="3" armor_type_name="heavy leather" equip_buff_id="" />
      <row armor_type_id="4" armor_type_name="chain" equip_buff_id="" />
      <row armor_type_id="5" armor_type_name="plate" equip_buff_id="" />
      <row armor_type_id="6" armor_type_name="decorated" equip_buff_id="" />
      <row armor_type_id="7" armor_type_name="cloth" equip_buff_id="" />
      <row armor_type_id="8" armor_type_name="spur" equip_buff_id="62ae725e-56d9-46fa-a09a-794480b757a5" />
      <row armor_type_id="9" armor_type_name="shoe" equip_buff_id="" />
      <row armor_type_id="10" armor_type_name="horse_saddle" equip_buff_id="e2f2e0c7-b1d0-4ec5-8f1f-9f412f547f2d" />
      <row armor_type_id="11" armor_type_name="horse_shoe" equip_buff_id="41e625ec-7783-46fd-8409-e2f05d93d023" />
      <row armor_type_id="12" armor_type_name="horse_bridle" equip_buff_id="061d9f55-6652-461f-bb64-471a631f2d21" />


Original Mod


Changed Items:
HELMETS:
Common Bascinet and Old Bascinet
Cuman Helmet and Light Cuman Helmets
Kettle Hats
Skullcaps


BODY PLATE:
Cuman Disguise
Cuman Harness
Heavy Lamellar Armor
Magical Cuman Disguise


GLOVES:
Riveted Gloves


ARM AMOUR:
Brigandine Pauldrons 
Lamellar Pauldrons
Plate Couters
Vambraces 
Riveted Pauldrons


LEG PLATE:
Light Brigandine Chausses
Short Brigandine Chausses 


CHANGED INTO PLATE:
Warhorse Brigandine
Milanese brigandines


Added:


HELMETS:
Cuman mask
Magic Cuman mask


GLOVES:
Composite gauntlets


LEG PLATE:
Polish composite chausses
Saxon composite chausses
Aachen brigandine chausses
Aachen decorated chausses
Riveted bright chausses
Riveted chausses
Riveted decorated chausses
Riveted gilded chausses