[Edi]

#additem "Jade Armor" works perfectly in map files. That name is what you use when you mod the item. The DB also lists what armor it gives, which references an entry in the armor table, which happens to be armor #107, Jade Scale Armor.

So #armor "Jade Scale Armor" is the one you are looking for. Attention to detail is required when modding, specifically what name weapons and armor you get from items if you want to assign said things natively to units via mod.