Regardless of that court ruling, the reality is children don't have many rights at all when it comes to school. School uniforms and dress codes are expressly for the purpose of limiting free speech.
It'd be different if we were talking about private schools. Public ones, however, shouldn't be have worse limitations than what people have in public parks or walking down the street, yet they do.
A school, private or public, is an institution. All institutions have dress codes of some sort. I cannot go to work in a miniskirt and heels, and I am required to wear a shirt to go to court when I have jury duty. In neither case can I sue for violation of "free speech". The notion that you have to dress a certain way to go to a certain place is one that people -ALL people- have to concern themselves with. Attacking the popular cell phone bans or the use of annoyance devices in bathrooms would have a case, but there's no grounds for a challenge to dress codes.
I wasn't aware there was a dress code for courts, but I'm pretty much equally against those now too. These things wouldn't be "distracting" if they weren't uncommon.
Though I'm unsure how a skirt and high heels would be inappropriate, regardless. Unless you're a man, in which case, that has to do with sexist double standards concerning dress, which is a whole 'nother can of worms.
Mormon commercials. Its funny. They purposefully make those commercials with the intent of NOT making people dislike Mormons, but for me, they're actually making me a bit annoyed by the part of the Mormon church that thinks its a good idea to make them.
The ones I've seen aren't that bad. Generally just preaching some "family" message, like spend time with your kids, with a "payed for by the Mormon Church" at the end. That's the sort of religious advertisement I have zero problem with.