Summary:
In the crafting menu, the Iron Coif has 5 DEF, while Plate Helm has 4 DEF, despite the latter selling for more and requires more skill (and better materials) to make.
Steps to reproduce:
Get a weaver
Look at Iron Coif
Look at Plate Helm
Expected Results:
Steel gives more protection over Iron
Actual Results:
Iron gives more protection over Plate
I am playing 2820 and I just had a footman remove the plate helm in preference for the Iron Coif. I had him switch jobs back and forth, and in the end he settled on the Iron Coif even though there were four Plate Helms lying around. None of my other footmen will take the Plate Helm either.
@CatieCat, based on the current code, what you are seeing is intentional. (That being said, the code needs to be fixed).
For those who like to understand how armor/weapons work, each item has an ilevel, which is used to determine whether the Hearthlings should use it or not. Hearthlings prefer higher ilevel items, so more powerful/stronger items have higher ilevel. At the moment, however, the iron coif ilevel is 10, where the plate helm is 9, so footman will take an iron coif over a plate helm.