Colored gear with specific classes.

[Nuru]

I just checked felt hats against their body pieces.

Green Felt Robe: +8 healing mag potency ---> Green Felt Hat: +4 Piety
Red Felt Robe: +6 Piety ---> Red Felt Hat: +4 Mind

So, to be an effective healer, you'd need:
Green Felt Robe: +8 healing mag potency
Red Felt Hat: +4 Mind

Bozo the Clown anyone?