Creature expert packs special item for cold climes (4)

I believe the answer is:

vest

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But I can't explain it at all! Could you help me understand?

(Other definitions for vest that I've seen before include "Clothing" , "Thesaurus compiler" , "Undergarment for vets" , "Undergarment to put in right of possession" , "Sleeveless undergarment" .)

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