I just had my b-day in August and had the same problem. I have plenty of cold weather stuff... so my wife let me pick out some warm weather bowhunting clothes. I got a nice Under Armour long sleeved HEAT GEAR camo shirt that is as smooth as silk to the touch- VERY VERY breathable for $32 and a pair of Cabela's camo pants, they are mesh, kinda like the mesh shorts you can by for athletic reasons. They were on sale for $30 so I'm happy now. My last pair of pants that I bowhunted in were just jeans that were camo (redhead brand from BP). They were NOT breathable and were hotter than heck.
JESUS is LORD!