My personal opinion is that you need to try numerous things on and buy on fitment. Everyone makes really good stuff. My personal gear that I would use for Colorado rifle season would be something like this:
Baselayers:
- Smartwool Thermal Bottoms (they fit me well - Sitka fits well too)
- Duckworth Comet Top (USA grown wool and Spun/Manufactured in USA)
- Sitka Heavyweight/Lightweight Bottom
- Farm to Feet, Darn Tough, or Duckworth Socks
Pants: (stone glacier is best in terms of fitment, function, and design in my opinion)
- Stone Glacier De Havilland Lite
- Stone Glacier M7 (waterproof/windproof/fleece lined)
- Sitka Timberline Pant or Mountain Pant
Midlayer:
- Stone Glacier Helio (maybe something like the Sitka Heavyweight Hoodie)
- First Lite Kiln Quarter Zip (great piece - their wool is great and the tops fit nice. Their baselayer bottoms have a low-cut fit and doesn't leave much room for the boys, so that's why I opted for SmartWool or Sitka)
Insulation: Down is better for when you're stagnant and glassing. Synthetic is better when moving.
- Stone Glacier Grumman Top
- Stone Glacier Grumman Bottom
- Any Brand of Down Top/Bottom (I know down is expensive so find something in your price range that fits/functions well. Maybe even look at Gerry from Costco, Patagonia, something from REI, etc.)
Outerlayer:
- Stone Glacier M7 Jacket (waterproof/windproof/fleece lined)
- Stone Glacier De Havilland/Headwall Jacket
- Something windproof and can shed light moisture (Sitka DewPoint or Stone Glacier X1)
Boots:
- Try on as many as you can to find something that fits well. Since you are going for elk, I'd recommend a stiffer flex.
- I've tried Kenetrek, Crispi, and Schnees. The Crispi fit me like a glove. I refused to try them on for years because I didn't want to be like everyone else, and man... Kicking myself for being dumb. I've heard Zamberlan is great and Hoffman, or White's. Maybe even look at Lowa or La Sportiva.
- If you're not using waterproof pants/hybrid pants, I'd recommend the Stone Glacier Gaiter
Gloves:
- Good ole leather gloves that I waterproofed
This gear is years of accumulation and I understand it's expensive. You don't need ultra-premium gear to get it done, so shop around and find good deals. If you are to spend your money on anything, spend it on a quality pack and quality pair of boots. Those will get you farther than any other piece of gear. Take any extra money you have and go spend it on ammunition and get to the rifle range. Practice acquiring targets quickly, shooting offhand, building shooting platforms, etc. If you do this, and get yourself in shape, you will likely find success. My first year mule deer hunting, I basically packed out (in the sleet) in tennis shoes and had a mystery ranch metcalf. It worked, but I would rather never do that again. I had mismatch gear on that wasn't warm enough and was shivering basically all day, but in the end I was able to take a 178" mule deer. It's all about determination, persistence, and mental preparedness, not your gear.