Some costumes allow the wearer to receive +30% monster exp.
Costume Goggles
Costume Crown
Costume Boys Cap
Costume Tiara
Possibly more costumes?
What im thinking is.. Why only these costumes?
I hate wearing them when levelling, then forgetting to switch back when in town or being social..
Couldn't we make it so we could 'enchant' any Upper Costume to hold this +30% monster exp bonus?
I know its a long shot, just a thought..