Hi,
We're happy that you follow the development progress so passionately!
All requests are written down in a list on devs Trello board, it's just that some features are higher oriority, than others, but surely dev will add most of them in a later time.
As for the costumes during the day, it's kinda useless right now, as during day to day interactions we only see a bust of Yuna, we never actually see anything below the neck, hence why outfits will definitely be available during the night time, where we can see her from head to toes.
I have no idea if dev plans to add some day events like Halloween or X-mass, where she'll be dressed in something else than her usual outfit, but if he does then this is where you could expect some outfit customization.
Time will tell.
Cheers