LogFAQs > #979498166

More research has shown that you can change your character's appearance in-game. Have to buy an item using in-game currency at major cities. The currency can be acquired either through doing stuff in-game (or through microtransactions, lol). That's a lot better than appearance changing being solely locked to microtransactions.

Still can't do playthrough restarts without manually deleting your save file though. So if you have regrets about how your character looks, either start deleting files or tough it out until you're able to get the item.