I always liked that blue and white silk coat (not actually brocade, I don't think, which is a stiff and woven fabric, but rather printed with a brocade effect) but preferred it with the hat and lighter-colored dress she wore the first time around. They created a better, more interesting contrast. She also wore blue shoes the first time, and I liked them better than the nude patent leather affairs. Still, it's good to see her recycling clothes. The very expensive, near-couture-level details of the fabulous white McQueen coat needed to be balanced out by something less costly and worn before.
I actually feel for her right now, having to dress to the nines for several events in a row. If I were she, I'd be longing for a return to Anglesey, jeans, and a few weeks of private life.
Her dresser will basically be in charge of caring for her clothes, keeping them in good condition, getting them pressed and cleaned, and so forth. She's said to like her own style -- and since I've liked it for years, I think she has reason -- so I don't think a full-time stylist is required. She'll need some help putting together a whole series of outfits for the Canada/US trip. An outside stylist could survey what she already has and advise her on what else to buy and how to switch pieces around to create new looks. My guess is that we'll see her rewearing some items in different ways.
The thin belt on the black and white dress worn to the wedding does indeed look more elegant and sophisticated than the wide belt she originally paired with that dress. It's a clear indication of the evolution of her taste.