coming from someone who hunts CA A zone in 100+ degree heat this is what I use:
BPS Enduraskin long sleeve (one cotton short sleeve shirt with chest pocket for the stalk as I put my rangefinder in the pocket)
BPS Enduraskin boxer
Wool socks with liner (extra pairs as I can go through 2 a day)
BPS Micro Lite zip off pants
Any other company making the same type of material under their name would work just as fine (ie UA heat gear).
I am trying out this year First lite wool base layer shirt and boxers to replace the enduraskin. Hoping it breathes better than the enduraskin, but we will see.