Morag, I think I'm just recalling what I was told at my image day, and what I've gleaned from a couple of other consultants I've seen since. I might have more info on the other types, but I've never been able to find anything detailed online, certainly not in the same detail HoC goes into. They seem to keep it quite secret.
I was given a leaflet thing, more tailored towards myself, but I'll try and dig it out and see if there's anything more.
Afair, gamines are often 'head girl' types. They look fab in uniform, which means military or naval styles are perfect for them. They can also wear quite large, strong patterns, in spite of their small scale, and tartan and stripes are fab on them. They can wear their hair really short (pixie cuts or the well-known 'gamine crop'), and they can wear minis no matter what their age 
. Also, their long legs mean capris/cropped trousers don't make them look stumpy.
One thing I was told, which amused me but kind of makes sense, was that the different personalities can be compared to pantomime characters. So the ingenue is Cinderella, the fairy godmother (satin, frills, curls etc) is the romantic, the wicked stepmother (strong make-up, angular, severe lines) is dramatic, gamine I suppose would be Prince Charming, and the natural would be ... I can't remember 
.
Cake I think you're right about La Kidman - she must be a natural with that hair. Re. the classic element: I struggle with this, especially as I'm an SAHM so rarely need to wear a formal suit, but I think it's more about a bit of extra polish - I can't leave my hair to air-dry, for example, although I appreciate that hardly makes me a contender for Miss Well-Groomed 
. Not sure if I manage it, actually - I often think if I went to work, I'd have a ball buying VW fitted jackets and even her bustle skirts. I try not to wear jeans too often (an easy trap to fall into if you're SAHM), and find, in the summer, capri pants are a good alternative.
You need crisp fabrics if poss, though, again, my SAHM-ness means I'm reluctant to have too many cotton blouses to iron. Little blouses with puffed sleeves are lovely, though, especially if they have tiny ruffles down the front . I think it's a matter of generally trying to keep things reasonably smart/polished, whatever you happen to be wearing. I think Dorothy's a lot more knowledgeable than me on the classic element, though.