Transmog system would be a great addition to the game. There is a pretty good workaround with this mod (if you're so inclined to mod your game): https://www.nexusmods.com/baldursgate3/mods/2922

There are a few transmog mods, actually, but this is the one I use and it works well for my purposes. Also note that there are dependencies and a bit of learning to do on the subject of how to mod correctly, so be sure to do your own research and back up your saves if you're implementing mods mid-playthrough!