Made of cotton equipped with air sensors and color-changing dyes, the shirts’ fabric shifts from black to white when in the presence of radioactivity, carbon monoxide, or particulate pollution.

Readers of a certain age might remember Hypercolor or Hypergrafix clothing, the color-changing T-shirts produced by Generra that were all the rage in the early '90s. Now that the '90s are back ...

In fact, in a brief three-month span, between February and May 1991, the company sold a whopping $50 million worth of color-changing, heat-sensitive T-shirts, shorts, pants, sweatshirts and tights.