Just had another little burst of inspiration about my once a mining town version of Canterlot. It explains why all the unicorns in the capitol wear so much clothing. Back when Celestia moved the capitol there was a lot of crystal dust and other gem mining pollution. So everypony who lived there needed to wear protective outfits of various types. Nobles being nobles a industry sprung up to make the protective clothing fancy and expensive. When the mine was closed, that industry wasn’t going to just vanish. So, poof, they make sure that the citizens of Canterlot enjoy wearing clothes.
Canterlot Headcanon 2