A number of public schools have adopted a school uniform policy (which I fully support) and it makes so much sense.
I am not advocating for school uniforms due to its' effects on academic performance (which so far, there has not been any definitive study that suggests its' impact). I am advocating for school uniforms because of it's eco-friendly impact and inherent cost savings for families with children. Imagine saving hundreds of dollars from children clothing purchases and re-investing that towards your children's educational pursuits.
To support exploring school uniform policy at your local elementary school, you can reach out to the Parent-Teacher Association (PTA) and get a sense of what the active parental leaders support, then with the PTA support, you can propose the policy to the school administration (e.g. principal).