Currently, the hibearnation vest has 7 days of max durability. This is extremely low. The only clothing items with lower durability is the straw hat and earmuffs' 5 days of durability, and the umbrella's 6 days. These 3 clothing items are extremely cheap and minimal clothing items. Cheap enough that you just craft a new one when it breaks. As opposed to the hibearnation vest requiring bearger's thick fur. The other 240 insulation body clothing item is the puffy vest, which has 15 days of durability. More than double that of the bearger vest. A sewing kit always restores 5 days of durability. But with the hibearnation vest, you have just 2 days of leeway before you permanently destroy a boss drop item.
I just wanted to get this out there, and I'll mention it again once the next QoL update is on it's way.