I have a fair bit of experience with Sitka and a little with First Lite and Kuiu. One thing I will say is that Kuiu makes a better all around pant than Sitka or First Lite IMO.

Obviously you can mix or match any of this, but these are the items I have stuck with. I am sure I forgot something but you get the idea.

Early Season for Bow and Warm Rifle Days
Lightweight Base if needed, I chose Minus 33 layers over First Lite due to durability
Kuiu Kutana, Tiburon or Sitka Equinox Guard Pants - Tiburon are the lightest most breathable, but pull pretty bad in briars.
Kuiu Gila Hoodie, Sitka Lightweight or Equinox Guard Hoodie

Midweight/Layering Stuff
Minus 33 Midweight Base
Kuiu Attack Pants (sold the Sitka Mountain and Grinder Pants after trying these out. Quieter and don't pull as bad with briars)
Sitka Fanatic Hoodie (very versatile and can be used at as layer or outer)
Sitka Ambient Jacket (very versatile and can be used at as layer or outer)
Kuiu Encounter Jacket (Very quiet and in between warm weather and when you would wear the Sitka Stratus. No wind liner)
Kuiu Axis Hybrid Jacket (Soft shell jacket that I replaced my Sitka Jetstream with. The Jetstream was loud IMO.)
Sitka Stratus Jacket and Pants (tried the bib thing and they just weren't for me. My core would always get too hot and they are a pain to pack in)
Sitka Midi or Gradient Pants (Do not wear these around briars if deciding to wear as an outer layer. No wind protection either.)

Cold Weather
Minus 33 Heavyweight Base Layers with zip off pants
First Lite Furnace w/ zip off pants (note that the Furnace is not as warm as the heavyweight Minus 33)
Midi/Gradient Pants (Great layer for cold weather. Have worn them on their own with a heavyweight base)
Sitka Ambient Jacket (great mid layer)
Fanatic Jacket
Incinerator Jacket (my favorite for packing in since it rolls up small, but I do not think it is as warm as the Fanatic)
Stratus Pants (pair with midi/gradient pants and a base will keep me warm into the 20s easily)