We had very strict uniforms all through school. I had to wear socks or stockings, skirt, blouse, tie and blazer.

I'm going to guess the thinking is to teach morals and expectations as to what's okay to wear. Do I agree with it? Not necessarily. But only because forced structure isn't teaching.
Further, I'm not sure this type of structure teaches real morals or empathy, for that matter.

In my experience a proper school uniform works better than a dress code. There is no ambiguity with a school uniform about what is allowed and what is not.

I would certainly be asking. Makes no sense whatsoever.

My dad would have punished me if the school gave me a punishment about my uniform such as lines or detention.

Should be the other way around. Put the high schoolers in a uniform.

my 2 oldest daughters wears uniforms my oldest daughter hates them my second oldest daughter is okay with them

That is strange. Our kids school is more strict with the older kids. hardly need a dress code with the little ones...happy to chat if ya want.

That does not make much sense indeed.

IDK.