… but no, it's CES2015 apparently, so almost a parody.
A Self-Adjusting Smart Belt: Yes, It’s Come to This
You can keep your 4K TVs and your autonomous puppy dog drones. The Belty promises to have a greater impact on humanity than even the wheel. It’s the world’s first smart belt featuring an electric-powered motor built into the buckle that automatically loosens the strap when you sit down, and then tightens the belt again when you stand up to head off any Benny Hill-esque pant droppings.