The temperature near your skin is greater than the temperature on the surface of your clothes, mainly due to a layer of trapped air near your body.

FORBES: Hack Your iPad To See Through Clothes? An April Fool's Prank With A Real Physics Lesson

In costume design, futurism and the futuristic mingle freely, mainly because no one ever has to buy these clothes, though some may wish to.

WSJ: We Can't Know What the Future Will Bring | Fashion