I love this idea, maybe with a prestige points, the hats can do other helpfull thingi really like these ideas:
Iron Helm increase power
Flower crown increases healing from heal blocks
Propeller cap lets you dig up one block (falling back down one afterwards)
Halo gives 10 light
Visor increases regeneration
Fedora gives a free dig every 10 digs
Baseball cap gives 20 stamina
it would also give Dwarven bracer more utility, but you dont have to listen to me, I just really like making stuff up for other games :)