This seems to be something that virtually all single-player RPGs struggle with. The only games that seem to offer a lot of cosmetic options are MMOs and other live service games, usually ones where they can charge you real money for cosmetic options. It seems very de-prioritized by the developers of classic RPGs, in general.
Now, besides the fact that it triggers one of my most fierce idiosyncrasies in gaming (I hate fucking giant pauldrons on armors with a burning passion), who the hell wants to look like this by the end of his adventure?
Unless you are SPECIFICALLY going for "gaudy paladin that loves to embarrass himself in public".