How do u keep cool when riding in 40'deg heat

[Landmine]

If its a hot day nothing is really cool. Mesh allows the air in but like being in a rotisserie. Leathers are hot especially in traffic but once getting along with some air flow is no hotter than mesh or Tee shirt shorts and thongs. Got used to the leather jacket dragging jeans and proper boots as minimum to ride. In the event of an accident I don,t like the idea of being skinned ready for cooking on the hot bitumen. Prefer to be done as a jacket potatoe.
Just my my thoughts.