I agree with bose-x that the risk is low however, the wearing of nylon garments is not a good idea and I suspect most pilots don't think about it. A bit like flying in shorts, but then we wear short sleeved shirts and I can recall operating C130s in KD shorts in Africa.
Nylon was No-No in the RAF and I think the current trend to fly in Hi-Vis clothing in aircraft generates more danger than safety and should be avoided. It also generates static and we prance around Avgas pumps where we can't use a phone that might generate 1.5 volts RF in a jacket that can produce 400V!