I think a simple paper doll system would allow people to see better just what they can and can't equip on a unit of course this might already be in the works but if not it should be considered.
Both unit creation and your sovereign himself could definitely use an mmo-style paper doll, or even just a list of items that are currently equipped, it can be a pain to hunt them down - especially in unit creation where the available items are split between several screens, you have to flip between 3 screens to see everything a unit is wearing.
Also, it needs to be clearer which "slot" a given item fills, I might happen to know that a Barbute and a Heaume are both helmets, but I bet the average person doesn't.