Agittayid
Throughout the years Orthodox Jews have always had a uniform. The chassidim have theirs and the litvish have theirs. In America as well the Yeshivish or people who want to be associated with them always dressed a certain way and Yeshivas have a strict dress code. Same for Chassidim. When someone comes from a Yeshivish or Chassidish family and he is wearing jeans it certainly says something about the person.
Yes in MO circles jeans are more accepted but even there those that are strongly tied to a more Torah way of life generally don’t wear jeans.
A person dresses how they dress for a reason. Its a representation of what they do, a group they are part of or their belief system. If you are a police officer don’t go around wearing a UPS uniform. And if you are a police officer and yet choose to wear a UPS uniform don’t expect people to assume that you are a police officer going to a purim party if its not Purim.