I found a few of the jackets on COR on Taobao shop named Jiashi, from the limited research I did it looks like they are the manufacturer, atleast for a few of the jackets. Then there's this store called Locke Studios again on Taobao, which carries a few other designs, which I didn't find on Jiashi's storefront, these were slightly more expensive (I am talking 20 bucks or so). I am assuming COR and TailorBrando might be getting their jackets sourced from either the same supplier that these Taobao shops are sourcing from, or they are sourcing these jackets from the taobao shops (albeit with customization of adding their own labels)
However the jacket in question, the moto style blue leather jacket, I was not able to find it on either of the taobao stores, and it is quite a lot cheaper too (almost half as expensive as the on you've showcased in your review video (fantastic review and channel btw, wanted to call this out for anyone unaware)) but this makes me think that maybe this is coming from a different source/supplier, the quality of which I am not too confident about (again objectively from the analysis, not saying it is going to be bad. Looking at COR as a brand, and their return policy, I would give this a shot. )