Joseph said “Ask yourself the question: Am I dressed in a very specifically Jewish way — in a manner that non-Jews don’t dress and that virtually anyone seeing me will immediately know that I’m Jewish?
If the answer is no, you need to do some soul searching.”
Sorry Joseph, but being in a white shirt doesn’t make you any more Jewish than being in a garage makes you a car. Soul searching has nothing to do with appearance. It has to do with what is in your heart.
A bochur in a colored shirt and (sarcastic C”V) Jeans with a love for the knowledge of the Tanakh shouldn’t be looked down on while a older man in a crisp white shirt and shtreimel who has C”V secretly abused a child or stolen money is respected because he is, as you said, “dressed in a very specifically Jewish way”.