I think you are better off looking for types of items than just going with a brand’s system.
Baselayers - Get zip-offs in light Merino or Synthetic (your preference), I think the Peloton 97 is a no-brainer for bottoms. For the top, you’ll want a light weight merino/synthetic that dries fast (I like the Sitka Core LW Hoody or the Sitka Core Lightweight Merino quarter zip). I really like the Stone Glacier merino boxers and the Sitka Light Weight Merino Boxers.
Mid Layer - Peloton 240 vest is a staple in my system. Cuts wind, adds warmth, and the vest allows me to stay cool while hiking. Sitka Kelvin Active is another awesome option. Consider a grid fleece hoody as well…lots of great options (i prefer the SG Helio Hoody to all).
Rain Gear - Filson Reliance Jacket can serve as a soft shell that is waterproof, Rain pants - find something lightweight and easy to put on —Sitka Dewpoint Pants
Puffy Jacket - You will likely wear this OVER everything else. It needs to be windproof and warm, but compressable for packing purposes. I have an REI Stormhenge that I use, but the other options you can look into are the Kuiu Superdown, the Sitka Kelvin WS. Some people go with a Puffy vest and wear it under their soft shell/hardshell (in that case I would get the SG Grumman Vest). The first light Uncompraghre is a lightweight, but still very good option that time of the year.
Pants - I think the FL Corrugate Foundry is the best option out there for 0-75 degree hunts. The open zip vents will let you take your base layers off. Pocket layout is awesome, Suspenders work great with a pack, and they are waterproof in the areas you need. The knee pads are a nice option, as well.
Puffy Pants - This is a preference and if you have room, but the Grumman Pants from Stone Glacier would be worth it for how light they are and the ability to zip them on or off.
Gaiter - SG’s gaiter is awesome, don’t overlook this; if you get into snow or mud, the Gaiter is going to keep things dry.
The Kiln beanie from First Lite is reversible (orange on one side) and the perfect weight, in my opinion.
I always have a ball cap of some sort with - I really like the KUIU Icon Pro, it dries very quickly.
Gloves are really preference—I usually have a pair of mechanix gloves, a pair of fingerless wool gloves, and I have been packing in First Light’s Brooks Glassing Mitts.
You can’t find better socks than Darn Tough. Again, preference on the weight, but their Over the Calf Merino socks do not pill much despite what you put them through and they have perfected the merino blend that absorbs the moisture and keeps your feet comfortable.