You'd think if you were filming a video you would ask them not to film you while your pants are down. I am suprised no one has tried to develop biking specific jeans that have integrated knee/shin pads.
It's the 'similar' results bit that bothers me... In reality you need a really smooth rig for the footage to be good enough to fool the viewer into feeling like they are really floating rather than strapped to the bottom of a RC heli. The slightest vibration or shake shatters the illusion. I've ended up working on a cable cam instead, they're not so easy to crash!