That sucks, but obviously you're not in the wrong here. You dodged a bullet. Companies that have dress codes or even care whatsoever what candidates wear to interviews as long as it isn't distracting or offensive in this industry are vanishingly small and generally aren't companies that put much value in their technology team and would run it like a cost center constantly trying to do things as cheaply as possible with an incredibly shallow understanding of the value of technology and a culturally baked-in unwillingness to accept it.

There's a company local to me that's notorious for this. They have a business professional dress code for ALL employees, meaning men are required to wear suits with white dress shirts and ties and women are required to wear dresses or at least skirts and pantyhose. They're an absolute joke in the local developer community, and known for being one of the most toxic environments to work in (even beyond the dress code). They're like a cult. They don't hide from this image or downplay it, they lean into it, and try to glorify that they're "different" and the special way they do things is what makes them unique and successful (which they aren't they're just an old stuffy printing company who hasn't completely faded into obscurity by begrudgingly attempting to adopt some digital media and somehow hasn't completely failed, yet). They basically only hire interns and try to keep them because nobody experienced in the industry will go to work there, and because interns are cheap they can afford to be the compensation leader for interns in the area in order to attract people despite the dress code being a huge turn off. Also interns are generally easier to convince that what they do is at least somewhat normal because they haven't had any other work experiences yet.