Anyone who has surprised a cat knows that raised hackles—a way of artificially inflating one’s size in the face of danger—are a classic “fight or flight” behavior. Somewhere in our evolutionary history, humans lost that ability. But Chromat , the so-called “architectural sportswear” designer beloved by the likes of Beyoncé and Taylor Swift, has found a way for people—and women, in particular—to look physically imposing when threatened. The “Adrenaline” dress, which debuted at New York Fashion Week on Friday, uses biometric sensors to keep tabs on its wearer’s adrenaline levels. Powered by Intel’s button-sized “Curie” chip , the garment features hourglass-shaped “wings” that expand and retract in response to variations in breathing and heart rates.