When someone goes to shul wearing sweatpants and a tee shirt with his favorite rock band logo, it is not a kiddush Hashem.
When someone has sports team logos painted on his kippah, it is not a kiddush Hashem.
When someone walks out in ripped jeans and a messy tee shirt, it is not a kiddush Hashem.
When people wear clothing that leaves much more uncovered than covered, it is not a kiddush Hashem.
Belive it or not I agree with you, But there is a difference between wearing a rock b and T-shirt with ripped jeans and wearing a Polo Type Shirt with khaki pants.
It seems people are saying you either wear white shirt and suits /tie or a T-shirt and ripped Jeans. and nothing in the middle
There is a middle ground.
BTW I know people who have blue collar jobs and wearing a white shirt with Suit pants is not a good idea, they will get real dirty real fast and they are not appropriate attire for these jobs.
And its not enlightend or Kiddish Hashem to realize that not everything is either or, most things are in the middle.