Have been riding here in my leathers when it's been 47 deg C and suffering the heat but just bought some textile gear with removable panels in the jacket and the pants for ventilation, wish I had done this ages ago,what a difference,now my ride is cooler.
I read up on all the different kinds of protection,leather ,nylon,cordura and kevlar etc and found many conflicting arguments for each that I decided that impact protection was most important followed by good abrasion protection and comfort so I have gone for a medium priced textile suit with ventilation which I will upgrade to the best impact protection.
I also changed from a flip front helmet to a solid full face.
I feel more uncomfortable riding without my gear on ( tried cruising down the sea front, shorts,T shirt and trainers ) did about half a mile and went back home for a walk instead. Yes, I am a complete wimp, with the emphasis on complete.