School uniforms are good. They work as equalizers. You don't know who is rich or poor in a uniform, because everyone wears the same thing. Uniforms also encourage dicipline. Kids have to wear a uniform every day, so they are going to have to get up earliuer, get in this uniform, dress the correct code, and frankly act more responcible.
Freedom of expression is not in the 1st Ammendment., The 1st Amm. sates the freedom to peaceably assemble, the freedom to petition, the freedom of worship, and the freedom of speech. Freedom of speech gives you the freedom to accuse the government of wrong doings, not wear a shirt covered in curse words.
How can you say that you're conservative and then push for state mandated equalizers?
The state can do whatever it wants, from a conservative standpoint, unless the Constitution says it can't. States used to be much more socially conservative and it was constitutional. Besides, they aren't equalizers of outcomes-- a liberal path.