Hm. I only have knowledge and theoretical skill, I possess no sorcerer's gifts so what little I could pick up from the costume is probably very little. Nonetheless, no lead is not worth looking into so at your leisure I would like to see the costume.
So no direct way to trace it back then?
And that's what I am suspecting, along with a suspicion it might be getting stronger. If it affects costumes from outside, and follows others outside of this town then it might yet continue to get stronger.