Given he only ever wore a sash, I'm assuming Chewbacca's coat of fur keeps him plenty warm. So it stands to reason that a hoodie made from Wookiee fur would do the same, even if you don't live on Hoth.
Unfortunately Wookiee fur is apparently hard to come by here on Earth, so this $70 alternative from Hot Topic is instead made from an even more foreign material—100% polyester.
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The embroidered ammunition sash is a nice touch, though, I often wondered why it was the only garment Chewbacca ever wore. Perhaps it strategically hid some part of the Wookiee's anatomy that would cost Star Wars its PG rating? [Hot Topic via GeekAlerts]