The fact that you can equate dress code to fascism just show how out of touch with reality you are. A business has every right to mandate a dress code you have the right not to want to work for an employer who does, but it does not mean that employer somehow hurts your freedom. Like it or not dress codes and uniforms do have positive effects they also have some negative effects but the same goes for casual dress code.

And yes I have read your comment but it doesn't matter, your job description doesn't have to be customer facing to mandate a dress code, the image of the office especially if there is high foot traffic in it might be important to your employer, the ability to drag employees at will to meetings, pre-sale, video-confs etc which might include external people without needing to worry about what stupid shirt they might wear today is also a good enough reason and overall having an environment where everyone can pick fairly cheap office work/business attire without having to worry about what they wear also makes it comfortable for a lot of people.

Oddly enough the looser dress codes usually go against the direct benefits to employees they are a tool just like the beer fridge, ping pong table and video games room that companies use to remove the gap between your personal life and your work life, they want you to feel that the workplace is an extension of yourself and home is where your bed is when you aren't sleeping in one of the nice sleeping rooms at your work.

Work cloths on the other hand allow you to easily switch between work and your personal life, you put a suit in the morning you go to work, you take it off and boom you are in your saggy tshirt that says I'm with stupid doing whatever you want. So if you are against the workplace invading into your personal space during off work hours you might want to actually rethink what brining your own personal life into your workplace does and why some employers especially in tech encourage that.