In fact, it seems the other mods I installed might not work either. I tried the New Clothes mod and it had the same result.
I need to know if the mods were actually installed correctly; you can send me a DM for better communication.
If that isn't possible, you can:
check if the installation of the relevant mods was correct,
re-assign Hazumi's appearance from the options menu,
I got it to work! Turns out there was something from the AIO mod's filename fixer I forgot to delete!
