It could be modified to make stacked clothing count.
As it is now, it only accounts for one piece of clothing, so for example if undersuit is completely taser-proof, but outer suit is not, it'd count as overall no protection.

To modify it, move applying actual effect out of this loop, and leave 'P.agony=P.agony*C.siemens_coefficient'.
That way every clothing item that applies will chime in, and after all checks are done, result is applied