Please, I’d love to have a Plague Doctor mask, especially in light of recent events. Perhaps whatever the original item is could offer Vitality Resistance and reduced Vitality Decay + Poison duration to reflect the anti-disease/stink properties (or at least intent, as the Miasma Theory turned out to be wrong; I’d also love GD to have actual disease mechanics where you could pick up plagues from certain enemies that last for a long time but TBH that might be more trouble than it’d be worth)? TBH I suspect most people would just want one for the illusion but still making it something at least occasionally useful could be nice too.
If you want to make it part of a full set (whether as a proper set, or just disconnected items that complete a look but don’t have set bonuses), it could either play up the doctor angle with a heal with Vitality Decay/Poison removal/reduction and/or a granted passive skill (either on the set or on a scalpel knife that would be part of it) with a name like “Anatomical Expert” that increases crit damage, or else go a route more similar to SCP 049 with bonuses to raised undead/pets in general, or even invert the healer angle completely and give bonuses to Bloody Pox.