Clear any forced clothes and your colonists will wear the best available clothes for the season. Muffalo fur parkas are a good source of warmth. Hyperweave is always the best material for clothes, but for the likely scenario where you don’t have access to it, you should use materials with a higher armor rate.
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Sheep wool will work in the warmer.
Dusters are more than good enough to keep colonists warm in winter and cool.
It's all well and good to pick the optimal outfit, but rimworld is about survival. Imho the perfect easy to achieve cold weather uniform is wool shirt and pants, fur parka (slightly higher protection at a cost of negligible warmth unless right on the temperature line), plasteel or recon helmet, and flak vest. Jackets are a middle ground between a duster and a parka, best suited to moderately cold biomes not extreme enough to require parkas. Clothing is a subcategory and type of apparel that generally offers good insulation but poor protection from damage.
Alpaca wool is actually better then mufalo for the heat insultation. All apparel functions in the same way. Providing your colonists with the clothing they need for the environment they’re in is key to survival in rimworld. Muffallo wool got a factor of 3 for cold and heat, making it perfect.
Megaspoth is better but inefficient.
Early game, my best tip is to rush flak research. Imho the best way is. I added a tailcap to soldier outfit preset for making soldiers stay warm during winter, but they are not picking this item up automatically. For biome with hot and cold seasons.
If you manage to get enough resources… devilstrand cowboy hat all the way. In those circumstances, players will need to adapt and give their pawns the best possible clothes to protect them from heat strokes and hypothermia. Or even the leather muffalo give starting out. If you need protection against really.
You can click on the i for each individual piece of clothing to see what it does to their comfortable range, weather insulating against cold or making them more tolerant of.
Get ahold of some devilstrand, thrumbofur, or megasloth wool, and you’re all set to start. In terms of singular clothing items, the duster is without a doubt the best item in the game. Rush helmets and flak vests.