I'm sure views on this vary. I still think at some level there should be a dress-code for school children, though it should not be restrictive by gender or any other divide.
The reality is that when they grow up and move into a workforce there will likely be expectations on their presentation, to pretend this doesn't not exist is an attempt at ignoring that reality.
School and childhood more broadly should (at its best) prepare a child with the skills to integrate academically, socially, and emotionally into their social environment.
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