(Half of this video is demonstration; the rest is explanation.)
Most people assume that the only viable way to keep the cold away is to defeat a beefalo or koalefant for warm clothing materials. But this way, you don't need to take the risk of beefalo ganging up on you or hunting being a chore. You only need to mine a lot and know how to fight spiders, the most basic enemies. And, of course, you need an alchemy engine if you aren't a beard-growing character.
As for the birch trees having leaves and all, that is a bug with having a short autumn. The Top Hat actually brings 3.3 sanity back per minute.
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