I remember, in a moment of curiosity, taking one of those quizzes to help determine a Kibbe type and was confounded by how to answer a lot of the questions. Some things are obvious (yes, I have fair skin and dark hair and strong features, so clearly I'm high-contrast), but others I just couldn't answer. Then, after making my best stabs at answers, I tallied it up and came up with such a smattering of attributes, it didn't seem that I fell into a category that they identified! (I can't even remember the results now.) So I shrugged and decided it really didn't mean that much to me because I can't imagine drastically changing how I dress based on these things anyway.
It's funny, I am an extremely analytical person, but when it comes to fashion, I'm much more emotional/intuitive. I enjoy a little analysis, but when it gets too prescriptive, I lose interest and actually start to want to rebel. If somehow I were typed as someone who should be wearing ruffles and embellishments and mixing patterns and wearing head-to-toe color, all because of the physical characteristics of my body, I would laugh it off because all of those things are the opposite of how I like to dress. If it were determined that my ideal style for my body and face is, say, that of Joan from Mad Men (which may not be so bad on me in theory because of my hourglassiness), I would say, hmm, that's interesting, and then continue to wear what I'm wearing now because I'm not very into retro dressing for myself, and that style doesn't play well with a very casual lifestyle.
So, even though figure flattery is a priority for me, and I do choose clothes that I think "suit" me, I really am taking into account my preferences, personality, lifestyle, and what tugs on my heart, just as much as my physical characteristics.