Everyone will have a simple costume made up of a headress and/or a top that they can pull over their clothes.
Aside from their costume you have two choices for things to wear.
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First choice is to wear dress clothes like you would choose to wear to a Christmas Eve service.
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Second choice would be something simple like a solid color shirt and nice jeans or khakis. No sweat pants or shorts.
If you have any questions just let me know.