Technically you're wearing 3 items, and the set requires 3/3 to activate the aura. I don't see anything wrong with this, though it might not be the way STS wants it to work.
Anyway, I think it would be nice if the devs respond to this - as in confirming they know about this, because in case anything about it changes, the vanity prices will probably change too, and it might affect the players' finances in a good or bad way.
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