Wool, canvas, leather and down sure worked well for a long time before any synthetics came along. They took more care perhaps. Skins before that were functional, requiring even more care. Used within their limitations, they have served man well enough.

For now, you can rely on synthetics to get you by. When the bubble goes up, we will be back to the 19th century apparel options once again.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)