No Dyable Part C

I'm not sure if it's just me or what, however, reg dyes only dye parts A(the main robe), and B(the straps) However, the part C is greyed out, and metal dyes don't bring it up, which is the skull belt. I don't think it's dyable

It might be fixed dye-only. I recall some items like certain glasses being like that.

Why would you even attempt with metal when the chart says leather?

obviously because reg dyes/fixed dyes didn't work? :\ nothing I've tried brings up part C