Madeline took up the topic of religious dress today. The way we present ourselves to the world is important. It conveys a message to others about who we are, who we associate with, and what values we hold. It also helps us internalize the values of the group we are a part of. If you wear a cross, it conveys a message to others. Presumably others will hold you to a certain standard of behavior. If you wear Mormon underwear, it conveys a message to you. You have a reminder to hold yourself to a higher standard.
Hasidic Jews have a code of dress that is visible. Many religions do. Religious leaders often wear a particular dress to set them apart. Hierarchy is often important in human relations. Members of the faith often wear jewelry or some adornment that shows their affiliation. When someone wears a Star of David necklace, we presume that they are Jewish, which is handy if you need someone to work for you on December 25th. We are a species that is designed for tribal affiliations. Religious dress counts for a lot.
Some people do it with bumper stickers, some people do it with religious dress.