Not sure if this has been suggested or already considered previously, but one costume piece I'd like to see implemented are Loincloths - like the ones that the Sybils oracles and Sister Solaris wear, or the one Romulus Augustus has, as well as the Storm and Death Shamaness of Banished Pantheon for the more witch-like loincloths.
Would like to see these options for both male, female, and monstrous body types.