The Carja Storm Ranger outfit (one of the deluxe edition DLC outfits) seems glitched for me, or at least something is up with the armour system.
I've been using it for much of the game too.
The thing is, it reduces the damage I take by like, 90%. But if I equip another piece of armour with similar or better stats it has no where near the same effect.
I've been testing this against the Thunderjaw's tail swipe. In Nora Survivor Heavy Gear with 23% physical damage resistance the Thunderjaw tail swipe takes about 90% of my health, and he has some other attacks that can one-shot kill me.
In the DLC outfit (Carja Storm Ranger) this same attack deals about 15% of my health.
Something is up here, and it might be what's causing the disparity between perceptions of difficulty too. Because I've noticed some people say this is game is really hard. It's really hard if I wear the wrong outfit, and I literally mean the wrong outfit. Because certain outfits get me one-shot even if they have better stats!