I was thinking, instead of having a huge number of helmet types, boar-cap, wrought, steel, druid, winged, dragon, we can have a few types of helmets, but use different materials, similar to how houses work now. Soft leather cap fit for a peasant? Sure, - hardened leather skullcap with boar tusk horns? Great! Don't have tusks? use deer antlers instead. Get agility bonus to helmet. Or bear teeth to make stronk helmet. The possibilities are exactly Y! (where Y is the sum of armor-material times horn/bone material)
Failing that, can we has dyeable plumed helmet using chicken-feathers or whatever helmet-plumes used back in the olden times™. Possibly made from wrought or bronze.