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His jacket is pure larp as any leather would become sodden with sweat when moving through difficult steep terrain, and leather is terrible in rain, even when treated (treatment which would make it even more sweaty). He looks simultaneously: far too warm for the warmer climes (Frodo was wearing a light cotton shirt and no shoes) with poor breathability and ventilation for the physical exertion he was in to, and too poorly insulated for waiting around in hunting hides, stealthy nights without a fire and stalking orcs, and his materials look like they wouldn't handle mist, nor rain and cold.
To be a ranger he would have absolutely NEEDED dry spare clothing, insulation and the ability to store his shed layers, which bumps his pack volume up way past that feeble leather tube.
I might be totally wrong in my understanding of clothing though, and underestimating the ability of ye olden people to embrace the suck, not to mention their better adaption to cold (more brown fat, stockier builds and better metabolisms), but everybody's gangster until your core temperature drops by 2* and you're suddenly hypothermic, your hands stop working and you begin suffering delusions that you're sleepy and too warm, and beginning to take off more layers - at that point, unless you have a ranger buddy to help you come to your senses or a friendly dwarf to spoon, you are dead.