Years ago there was a touring exhibition of her dresses - some just seemed to overwhelm her delicate, feminine look (ie big plaids or overly flouncy stuff), especially combined with her signature sporty haircut and harsher 80s makeup. But there were definitely standouts - the one I recall most is the beautiful off the shoulder deep blue gown she wore to the White House and the iconic image of her dancing with John Travolta.
With Kate, I really feel like she chooses her own clothes and that she has already defined a style of her own - and that it will continue to evolve, particularly as her role transitions over the years.
I could see the Queen weighing in more heavily on the jewels - suggesting pieces that were meaningful or that she thought would be suitable for Kate. As Queen she is caretaker of an extraordinary collection and how it is displayed, so of course she'd have an opinion or two about the tour. And that's where it would make a lot of sense of one of the Queen's people met with Kate to go through the choices and get it sorted out.