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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No. Exotic armor breaks the rules of combat in pvp. So being able to quickly identify when someone is wearing it is important to balance. Letting someone hide what they are actually using gives them an unfair advantage.