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Could it be layered inside clothing, to generate power from body heat?

Trace amounts perhaps. Generally speaking radiative heat scales as T^4 where your temperature is measured on an absolute scale like Kelvin. In addition most of the heat flux being radiated by a human falls in the the 10um range which is somewhat difficult to detect and most certainly difficult to convert to electricity.

In short, think microwatts.

I guess there's more energy to be harvest from stretching and shaking your clothing while you move.

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