I wonder if any of those stores allow you to get animal features for characters like ears and tails. It might also be fun for those to be in the character creator as well, since there are options for non-human NPCs.
Right now I think for the larger transformations like fox tail ear etc. Theyll be restricted to certain relics/curses. For instance already in the game, there's a place called the golden forest, that'll let you find a flesh seed relic that lets you pick from the animalistic transformations.
I am thinking though of questlines around it, maybe a noble wants a new "pet" fox.