Montessori is indeed about independence and choice. It sounds like some schools offer choice in color of shirt, though they all have the school logo. In some ways the uniform can promote independence, because they are easily found in the wardrobe and easier to put on than, say, the jeans and button shirt or other 'matching, cute' outfit that a parent might choose to dress their child in.
This is independence in the smaller sense, that of dressing oneself, rather than the larger sense of expressing oneself through clothing choices. I think that TRULY letting your child choose what he/she should wear each day can be a bit overwhelming and frustrating for them. If , on the other hand, the parent is laying the child's clothes out the night before then that is not choice or independence either, is it?
If you could guarantee that all parents will make all purchasing choices based on what is manageable for the child, rather than what is 'cute', then I would go against uniforms. In the mean time, I think it's a good option.
One other thing; when the children come to school in uniforms, you are at least guaranteed that your child will not be confronted by walking Disney billboards all morning!!!
