I was loving on my Pilgrim's hat, but then I realized I don't get the bonuses from my Spruce Hat, so I have a suggestion.
1 - Allow us to slot non-armor hats into cosmetic hats.
2 - Allow us to slot any into the German Pointy Helm.
This allows us to retain the items utility while sporting our awesome hat, without hiding armor items in things that don't make sense.