Here's my input based on experience, light weight merino wool baselayer shirt is a must. 150 weight or so. Anything heavier, and you should go synthetic do to time to dry. Same for boxers. Those right there are worth the cost and a premium for me.
Anything by first lite, smartwool, minus33 will work. BlackOvis (same as Camofie) is my recommendation based on price and customer service.
The life of merino wool i've found to be 2 to 3 years based on how much and how hard you are running them and with a pack or so. They fray, pile, and rip.
Merino socks is another must have for me. I'm partial to darn tough.
Another must have, even if it's 90 degrees is a puffy jacket. FL uncompaghre, Sitka Kelvin Lite, Eddie Bauer, Stone Glacier, etc will be good. Sort of depends if you want down vs synthetic.
But get a puffy coat.
Outside of that, I've found the same thing with pants and jackets. The life expectancy of them does not warrant the cost for a lot of the high end companies, but sort of depends how you run them.
Sitka at 50% off does in my opinion due to their customer service, or even 30% at places you don't have to pay tax.
Outside of that, again BlackOvis is putting out great low cost stuff for pants, make sure to check them out.
Eddie Bauer pants do not last me more than 1 year for me, but again, they have lifetime, so you can take them back and get a new pair. But every pair i use for hunting, the pockets work out and lose stitching.
Prana Zions are good too, I just like more pockets.
lightweight rain set you can throw in your pack just in case and if weather looks to be raining a lot, a heavier weight set.
For my Sept elk hunt I use:
baseball hat
merino stocking hat
150 weight merino long sleeve with a zipper.
Fleece pullover/hooded with stretch
Puffy Jacket
lightweight rain set
Some type of lightweight synthetic pant with stretch
darn tough/farm to feet merino socks
That's a decent start to work off of
