There are many reasons to have school uniforms. Growing up in a school system that does this for elementary and middle school:
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it allows the wardrobe to be much more simplified so students don't have to figure out what to wear that day.
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Kids don't have to get jealous of others for wearing fancy brand names or maybe in some bad areas they'll do gang colors or something.
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The prices are generally ok, I was never complaining at the prices.
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It might reinforce dressing up professionally even if the clothes aren't the most comfortable.
The way my school district worked it never looked for the brand names or anything, just so long as it fit the guidelines.