A sweater that regulates your body temperature and changes color to reflect it.

Using some kind of not-yet-invented living-esque material, it could be “set” to keep your body at a certain temperature, and as the color changes from blue to red, the color change could be the adjusting of the thickness of the actual fibers (for example; not necessarily how the final mechanics would actually work) and so the blue fibers could be smaller letting more air through, where the red ones could be thicker keeping more heat inside it.

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