Are they rescreening it someplace?
Yeah I'd avoid the Nazi uniforms, maybe you can find those partisan/guerilla uniforms they were wearing before they actually had to dress up as Nazis. That kind of garb is usually pretty easy to throw together yourself from an Army Navy store or something.
EDIT: Oh, I suppose by "go" you mean to a Halloween party or something, at this time of year...yeah no one will read that as "Hey, they're the characters from Inglorious Basterds when they were pretending to be Nazis!" they will just think you dressed up as Nazis.