Sorry, but I don't share your opinion.
I find uniforms to be easy and convenient. There are usually a variety "approved" items for the kids to wear, including sweaters, short sleeves, shorts, etc to address the heating/cooling issue. Likewise, they come in regular, slim, and husky sizes.
As for individuality, I think that's found inside a person, not in the clothes somebody wears. If we remove the status symbols and fashion fads from a kid's wardrobe, his or her individuality is more likely to shine through. Otherwise, it's masked and artificially tied to brands and styles he or she wears.
Finally, I don't think expense is a huge issue. Parents usually get new school clothes for their kids anyway. It's just a matter of trading a "regular" clothes budget for a "uniform" clothes budget. Plus, with uniforms, a family might actually save money because there's much more opportunity for hand-me-downs...even between boys and girls on unisex items like sweaters and socks.
Sorry. You probably don't like my response. But, look at it this way: Maybe by reading the other side of the coin, you'll be better prepared to present your case.