Make custom accessory for player?

Hi, so I downloaded a Jayson Tatum mod which gave him a custom short medium band, but it also changed every medium band for other players and made it very short as well. Is there a way to keep the short Tatum medium band but also the original medium band? Any help with this would be greatly appreciated. I know there are some mods that do this like with Yangfugui's accessories on Wembanyama for example?