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No official word yet, but...[edit source]
I don't think this is a bug. If costumes were displayed for PvP players, it would effectively let you hide what build you were using, and I can't think of many PvP-enabled games that allow for that. This was probably a deliberate balance decision on the part of the devs. --188.8.131.52 03:43, 11 June 2011 (UTC)