I've finally reached over 100 days on a character with (almost) only crafted clothing, no rifle, and no prepackaged food, and I have some ideas of game options for living off the land more naturally, instead of scavenging old stuff from ruined civilization
1st, add a craftable hat or scarf! the most obvious is a rabbit skin hat that takes 3 or 4 to make, with similar stats to the rabbit skin mittens. People have been asking for this for a long time.
2nd, make new in game items and a new skill class for flintknapping. Maybe in certain areas there are pieces of flint or obsidian lying around. You take those, and with a rock, you can try to craft arrowheads, knife blades, or axe heads. At low levels, the chance of failure is medium to high, but with every attempt, success or failure, you gain flintknapping skill points. With these completed stone tools, you can make arrows normally, just with a stone point instead of metal, a stone knife with the knife blade and a piece of cloth, and a stone axe with the axe head and 1 piece of fir wood. These tools would be a little less durable than metal tools, but lighter.
3rd, add options for primitive firestarting! a bow drill kit can be made with 1 cured gut and 1 stick for the bow, and 1 or 2 pieces of cedar wood for the board, spindle, and handhold. The bow is a separate piece, and doesn't lose condition (or maybe degrades very slowly), but the 3 other pieces are treated as 1 item, and lose 10% to 15% condition with every firestarting attempt. The higher the level in firestarting, the longer the bow drill kit lasts.
Another thing, maybe make an option for a lighter bearskin coat or vest that takes only 1 bearskin to make.