One of the coolest things about being a programmer is the lack of formality. People laughed at Mark Zuckerberg in the 2000s for enabling a culture where everyone wore a t-shirt and sweatpants to work. These days, it's not even a second thought that tech workers are not dressing up in a suit and tie.
As somebody who works in an artsy-fartsy industry, I openly enable coders and programmers wearing their pajamas to work. We've got to stick together in this world and fight against the rules and regulations business people try to place upon us. If there's one thing liberal arts people and STEM people have in common, it's disdain for the foolish antics of former business majors. If people who work for Petco corporate want to wear ugly button-downs every day of their lives, that's fine with me. I just don't want their inane standards thrust upon myself and the fine people of the coding community. We are casual, and no consultant will ever take that away from us.