Color changing fabric- hot or not?

Manufacturers have developed a fabric that changes colors when exposed to heat. It was all the rage in the 80's, but faded out quickly due to technical flaws. Now, it's making a come-back.
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Think: mood rings. A thermochromic substance in the fabric changes color as it changes temperature.
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Brooklyn Royalty's spring line capitalizes on this 80's fashion fad.

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American Apparel makes a color-changing t-shirt, too.

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In theory, sounds like a cool idea. But reality? I have images of this:
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Wouldn't it just emphasize those areas of your body that heat up faster?
What do you think about this technology?