yep thats me
that ones from the Sini desert
I find an shirt with a t-shirt undernear + hat + long trousers to work well in hot temperatures below 37 degrees (it was quite cool whilst i was in Sini)
but remember that in very hot and dry climates the air temperature is often hotter than your core body temperature (core temp 37c)
so exposing your skin to the air is not going to cool you down but heat you up!!!!!
in this sort of heat you need to wear layers to insulate yourself from the surrounding air just as you do for the cold (think oven glove)
if the temperature is above 37degrees than i start to look like the little picture on the left
inside all these layers you will be a humid 37 degrees which sounds hot but is better than being exposed to the air which is 45 degrees (or more)
also when wearing a wide brimed hat and shirt remember to button your shirt all the way up to stop you burning a neat triangle at the base of your neck where you left your shirt open and remember to cover your hands as the backs of your hands will burn