I happen to own a Filson, a LL Bean and a Cabela's Legacy wool coat.
I have a stupid question, are you looking for bowhunting or regular daily usage?
And are you looking only for plaids or do you want camo?
I only ask because, I would not suggest the LL Bean or Cabela's legacy for bowhunting, because the sleeves inside lining is noisy.
At least the ones I own have that lining. Both are warm and great coats, but I would not use either for bowhunting. I use my red/black LL bean for rifle hunting, but a little noise doesn't hurt when I'm sitting in a blind, expecting 40-120 shots with a .350 Rem Mag laying across my lap. LOL
I use my Cabela's Legacy for when snowblowing my long driveway. Again, great coat, but the lining is noisy.
That leaves the Filson if looking for non-camo. The Filson is all wool. A premium garment that will easily outlast you. Expensive, but easily the finest quality of the 3.
Now, if looking for camo wool, I suggest Day One for the price/quailty ratio. I have the heavy wool in ASAT and it's my main hunting wool, depending on the background.
I do have the "old" Cabela's Outfitter Camo in wool, and mine is awesome. But mine is the old stuff when Pendleton made it out of 100% premium wool. I can't speak to the new stuff, which I believe is now a blend.
I just sent a check in today for some relatively rare blaze orange wool bibs and vest from Grey Wolf Wool. Also super great stuff. I believe they have plaids, but if it was me, their Predator Grey is their signature product and great quaility.
KOM is obviously super stuff. But for that money, I can buy 3 whole outfits. Day One in ASAT light fleece and ASAT wool, and still could buy something else.
Here in mid-Michigan, I sit and wait when hunting. I'm mostly confined to my own land. I buy big and layer up heavy if cold. If I was doing a pack hunt in the wilderness, then some of the highest end stuff could make sense. But the reality of my hunt club is, I'm never really farther than a 1/2 mile from the truck and a 10 minutes away from a hot shower and a cold beer. LOL
Hope this helps.