Is this a BAD idea??

Well, in celebration of The Harry Potter movie, we wanted to go to the mall in Harry Potter (cosplay. nerd word for costumes) Is this a bad idea. You thnk we will get kicked out. my mom said it is a place of buisness blah blah blha, but III think we will give someone a good laugh:) I mean we werent going to HARASS anyone by referring to them as muggles or anything.....not REALLy....*looks guilty* xD WE JUST HAVE THE ROBES WE DUNNO WAT TO DOO WITH THEM ! XD