I'm not sure about that. Charles is pretty old school when it comes down to royal regalia.
The British royals used to dress to the nines for gala's, opera's, film performances and official dinners. Sadly that magic has died away for the British royals. They have managed to cut it down to just the State Opening of Parliament, State Banquets and the Official Diplomatic Corps Reception. They also wear their regalia at the Balmoral Ghillies' Ball.
I do think it's sad that they don't have many pictures and videos of these events. One thing about the other European royals, they have managed to keep their regalia events alive and fresh. Their events don't look outdated and I think most royal watchers, especially on these forums, can't wait for another royal regalia event to come up. There may be a regal event included for the Dutch Inauguration. Also, I think Princess Madeleine's wedding will require regalia for the royals.
As a senior member of the royal family and future Princess of Wales/Queen. I think Catherine deserve to wear the royal family heirlooms like royals before her. Some of the jewels will only pass down to her once she's Queen Consort but there are jewels she can wear as the Duchess of Cambridge.
As Queen Margarethe put it- the jewels are made to be worn and not locked up in a box collecting dust. She dug the Cartier Scroll Tiara out, time to start digging for some more when it's needed.