Jeans were originally made for the lower working class people because they were more durable than clothes made from other materials. If a person chooses to wear jeans, no matter how dressy, then he chooses to identify with the working class type of people. That is the reality and there is no need to do teshuva because no one claims that it is an aveira to wear them, just face the facts that this is how people identify him/her.
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