And there is the choice we all make in everyday life. If your life is professional and formal, there's a dress code which is only a bit flexible unless you are a super high flying rainmaker, or you don't care about the salary.
If you wear a uniform for work, completely irrelevant.
If your job is being royal, which is also political, your choice of what to put on is fraught with subtleties most people never even think about. We're in Canada, so there has to be a red bit, or France, so a French accessory to an English designer outfit is a polite compliment. I wouldn't be a royal dresser or stylist for less than 10p annually. It is so fascinating to watch.
The current generation are nailing it. I can't quite be bothered to keep up with the royal fashion thread, but the European monarchies are supporting the best of their local high streets and their fashion industries. And to go back to the matching debate, at the moment, the general rule is co-ordinated or clashing, not matching. Unless it is a sad formal occasion.