I’m looking for a super warm winter coat that will last me forever. Something that will keep me warm around -30 C. I’m thinking military surplus, because it should theoretically be more durable (right?).
Price isn’t a huge issue if the quality is worth it.
A navy peacoat is the closest to what you’re describing - warm, durable, quality. Suitable for -30, may need a sweater depends how hot you run
They’re really not for cold climates.