Merchants change clothes the more you buy their stuff

Title. Idk if someone made this so far, but a mod idea I have is basically when you buy a lot of stuff from a merchant, the next time you visit them they'll have better clothes.

Say buying a lot from Belethor will have him wear noble clothes or something the next time you visit him.

Bonus if the interiors get an improvement too. Say Snazzy interior-level but dynamically tied to how much gold they get from your purchases.