Environmental concerns, and concerns about the ethics of wearing fur, are nothing new. They're not even new to the Royal Family. King Edward III explicitly banned all Royals present and future from wearing fur by way of royal decree as long ago as the 12th Century, and his declaration has never formally been removed or overturned.
It is, however, periodically ignored. Within the past five years alone, both the Duchess of Cornwall and the Queen herself have been seen wearing hats made of fox fur. It seems unlikely that neither of them would be unaware of the royal decree, so it might be the case that they now feel that this is a law so old that they can simply ignore it. They do come in for criticism from animal rights activists every time they do it, though, and so for the sake of a quiet life it might be better for them if they just go back to playing by the rules.