Well if this is really true question.
Wearing a costume in public could bring good vibes or it could bring trouble.
These days alot of people can be objective to doing this but then it depends what you are wearing.
I know l did watch a series on tv where this guy was in a club and they would go to a park and play out there fantasys.and play sword games and they were all dressed up
The series was called Beauty And The Geek.
So maybe if you go out as a group it would proberly be alright.
or you could just put a costume on at home at least there you wouldnt get objections.