The Gina cloth-covered car is a prototype vehicle from BMW that is covered with fabric rather than metal. Like a living animal, its skin wrinkles a bit when elements are extended (like opening the doors). See it move in the Gina video below.
(Video shows moving fabric of Gina fabric-covered car)
The shape of the skin can be altered by the car's owner; it is stretched across flexible metal wires attached to the frame that can be moved with hydraulics.
The fabric itself is a silver expansion-resistant textile that is form-fitted to the car's structure. "The high-precision fit of the material to the metal mesh also allows surface changes without slackening the tension," a spokesman said.
Police cars would need an advanced surveillance-style fabric; consider the sonomagnetic fabric used in David Brin's Earth as a fictional start on the idea.
I think everyone would like to cover their car with Zetix Blast Resistant Fabric, which is a real-life analog to the super suits of comic book characters.
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