uniform v. costume

I do have a pair of Groucho glasses – eyebrows and mustache – that I sometimes wear at work. Would this be clown-like? I wouldn’t want to frighten my companion from Ft. McHenry. She put re-enactors with clowns because they wore uniforms. What about other uniform types – police, fire fighters, catholic schoolgirls? Are they frightening too? Clowns wear costumes, not quite the same as uniforms. Would she be a-feared of trapeze artists? Opera stars? Actors? Re-enactors? Re-enactors don’t really wear uniforms. Since they’re not actually civil war soldiers, they are wearing costumes.