Why is it our grade school and middle school has a dress code but our high school does not?

My second grade daughter got a dress code violation today because the straps of her shirt were too thin. My 15 year old daughter can wear whatever she wants to school regardless of how much skin it shows. This is the same school district. I should probably ask them but wanted to hear other peoples thoughts on it.

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Peaceful · F

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.