since I haven't seen this mentioned in regards to surviving intense heat: If you have to be outside and the air is hotter than your body temp you will stay cooler by wearing loose full length pants and long sleeves than you will going for the minimal clothing approach.
This doesn't apply to high plastic fabrics as much but with natural fibers and the like wearing loose clothes traps a layer of air the same temperature as you next to your skin instead of letting you bake in the higher temps. Plus it helps with the UV exposure part of the equation.
The robes and veils of desert dwellers developed because they are practical in those temperatures!





























