One time my hubby and I were bump up to first class ( when first class was really first class) because we were dressed nicely.
It can’t hurt to look polished.
There's no question that people treat you more respectfully when you dress nicely. I'm one for who wearing a suit and tie is no big sacrifice; I wore a uniform all my professional life and you learn how to keep sharp and tidy. Now that I'm retired, I only wear a simple suit and tie on Sunday for church, but if I go somewhere after for breakfast or whatever, people perceptibly treat you with more respect.