The PPP site instructs runners to read the FRA Safety Requirements of which para 9 a. refers to "Windproof whole body cover". Para 9 b. allows the RO to add "any other body cover appropriate ..."
A lower para also allows the RO to demand additional safety requireemnts (eg "waterproof...).
But just to keep it simple: does your "whole body" exclude your hands? Or your head?