Is wearing a hat and jacket on a trip to the zoo in ninety degree weather really more of an honorable thing to do? I think gentiles will consider that a bizarre and quite radical activity, not a respectfeul one. One who dresses nicely, wears a yarmulkah, and ACTS (this is a big one, and it counts, I see many jewish looking people act in a way I’m ashamed to affiliate myself with them)like a mensch, isn’t that a jew?!
Don’t worry, his modest and respectful dresscode and behavior will definitely be noticed and linked to his judaism when everyone else is dressed for the beach and yelling like they’re on a roller coaster…