Does your child's (public) school have school uniform dress code? Did you opt out?

I just checked my local school district's site and parent's can opt out of uniform, but here are the reasons posted making the case for uniforms.

Research suggests that school uniforms

Improve discipline, self-esteem and self-respect.

Focus the student towards learning.

Eliminate the fear of whether their clothing choice will be acceptable by peers.

Strengthens school pride.

Identify student population from strangers on school grounds.

Cost effective.