evolution of human hair

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And supposedly, this aquatic ape concept explains why we're the only primate to have an extra layer of fat, etc.

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Heh. And why we have flippers instead of hands. And why we can hold our breath for up to thirty minutes at a time. Oh, wait....The aquatic ape "theory" is pretty much like the "aliens built the pyramids theory", the "ancient Europeans lived in a matriarchal, Moon-goddess worshipping society theory", and the "God created the universe in 6 days about 6000 years ago theory". It is basically a bunch of ad hoc explanations for a bunch of random facts that are contradicted by the mass of actual evidence.At any rate, my guess is that long hair is a result of sexual selection. However, unlike beards, breasts, and wide-hips, it is exhibited on both sexes, so perhaps there is another explanation.

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"We must respect the other fellow's religion, but only in the same sense and to the extent that we respect his theory that his wife is beautiful and his children smart."
-- H. L. Mencken (quoted on Panda's Thumb)

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...starting with it being a signal for health\fitness....

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Although, as Dawkins explains in The Blind Watchmaker, traits that are due to selectual selection may be selected for no other reason than they are being selected.

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"These monkeys are at once the ugliest and the most beautiful creatures on the planet./ And the monkeys don't want to be monkeys; they want to be something else./ But they're not."
-- Ernie Cline