You need to head to the Sugarbush to the Priestess of the Ancients if I'm remembering correctly. Just let me know if that's not correct, its been some time since I created that mission.
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Yeah I figured it out like 10 minutes later. Very good looking costume btw.
Also, might be a good idea to add some sort of dialogue when talking to the researcher guy referencing the priests, or maybe make the quest or item name make some reference to the fact that the store lady called it the "Priest Armor" since that could steer people in the right direction.