most probably this will get implemented partially: using the cloth to cover SOME parts, like a moveable rear wing/ front radiator / headlights/ etc.
Basically build the car as usual, then put the cloth in the parts where you need to have it move. or the parts that usually have seams and cause aerodynamic drag (like the bonnet/frontbumper area).
this way you can get the best of both - and since its a smaller area, if it gets knifed, replacing is problably much cheaper.
And in fast sports cars they can make the car change shape according to speed.