It's about everybody's style and fashion. That means the cloth you wear can tell others what kind of social category you are part of. Just look at a peasant compared to a king. They were from different social categories and that was visible especially when you looked at them and the clothes they put on. Today, we see the difference when we compare an emloyee in a bank to a man who works in a factory. They have a protocol that dictates them what kind of clothes to wear.