I'd check out Kuiu as advised and also Kryptek.
They're both of very high quality as far as i know.
Only have hands on experience with Kryptek, and it's the only clothing i will buy for hunting after trying a few of they're products.
Kuiu is more lightweight, and possibly have slightly better 'breathing capacity.
Kryptek is heavier and more durable, the only thing i will put my finger on is they're hoods being too large for my taste, as they're designed so they can be used with helmets.
As for base layers, for cold weather I never use anything but wool. The advantage with Merino is only that it will not itch/irritate you're skin as some normal types of wool do to some people.
Any base layer of similar quality/density wool will pretty much work the same for insulation, what you may get with higher priced product is better stitching,seams and more durability. And well you get camouflaged base layers of wool if you pay a premium for it.
I'd never wear synthetics for cold weather base layers, but each to they're own.
Synthetics can possibly transfer moisture out of the base layer better in theory.
But then again if you get wet/moist synthetics will cool you're body down much more rapidly then wool.
Wools insulation capacity increases when it gets wet, and it will keep you warmer if you get wet it's as simple as that.
Living where i do i spend plenty of time outside in single digit temps, and having spent a lot of hours lying out in the cold and or wet stalking deer in open country. I've found nothing that keeps me as warm, dry, and comfortable as wool does.
Now i do wear wool socks like 60-70% of the year so i might be a bit biased.
I do probably have another approach then most people do though, having some steep mountain slopes to climb i generally just wear outer layers, ventilated as much as needed, and some very thin synthetic base layers, until I'm up where i intend to hunt.
Then I strip everything that sweat or moist off and change to wool base layers, wool or fleece insulating layers and insulated weatherproof outer layers.
It's certainly the most effective way of keeping warm if you do hunt from stands,blinds etc. Or you're fairly static like prone target shooting in cold weather.