I would use an exotic armor piece that would actually help me out a bit, but I don't want to break my armor's aesthetic. If I could use a legendary ornament I'd be very content.
EDIT for all that don't know what grass is: Even if it means giving a PVE ornament slot and a PvP ornament slot (only ornaments for the armor piece) that would work. I just want to use an exotic without ruining my look.
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It won't happen for pvp reasons unfortunately. Even at high end pvp, simply swapping your armor the moment the introduction is over immediately removes the advantage of knowing the enemy's armor if the exotic armor is sharing a legendary ornament with one of their other pieces.