Rabbi Meir Mazuz related in a recent Motz’ei Shabbos speech Rabbi Ratzon Arusi shlita (Rabbi Bar Ilan’s rabbi) encouraged the men in his city (Kiryat Ono, presumably) to wear their Tallis on the way to Shul.
Why? Shabbos observance was suffering. He wished to publicize the Shabbos, and ensure it is honored.
That’s exactly what rabbis are for and what customs are for.