Stephanus,
Excuse me? How do good JWs do their parts in the assembly dramas if they don't dress up as Egyptians, Babylonians, Philistines and other pagans? It seems they have two sets of rules...
You have to remember that this is not carousing with dancing and getting drunk. This is more like theatre. Like they did in Jesus time. Remember that there were no women perfoming theatre in those days.
OK. bad example.
Actually the plays in the assemblies are modeled after the simpler times during Shakespeare. Ok. bad example again. We would not want people to think we are gay.
OK never mind.
Costume parties are bad just because we say so. So there.