I liked the Triumph of Individual Style book too, because the stuff in it is geared to *your* body, *your* coloring, etc. The exercises are about examining your own features and then determining how you can echo those features in your clothing choices. Psychedelicate, if you like reading about style systems, I would highly recommend this book. I enjoyed it lots. :^)
In one of the exercises, you were supposed to determine how much certain features on your face showed curves or showed angles. When I did the exercise, I found that I was roughly half curved and half angled. The Soft Gamine category (from what little I know about it--I haven't read the Kibbe book) would have me pick almost exclusively clothes that emphasize some kind of curve (soft drapes, circular details, peter pan collars). But I like more how emphasizing my angled features creates more movement and excitement in my outfit. So that's what I choose to do. :^)
I'm glad you were able to fill in the gaps with John, Alexandra! It's always exciting to find another system of thought, because it allows us to think about our clothing options in new ways. So you don't have to become a slave to any system in particular, but each system gives you more tools and more ways to think about your style. It's good to have more options!