Okay I understand the confusion. The bank example you shared above is in reference to a private organization, and my response was in that context.
What Ghamidi sahab talks about is in reference to a state, and that is absolutely correct in the light of the Quran.
Even at the state level, an entity can enforce dress code or a uniform. For example, the police department has a specific uniform for their employees, and there’s nothing wrong with that.