I sadly had to throw out a whole bunch of clothes (*lip trembling, eyes watering*) because of a lack of storage space. I have unlocked all the slots, but it feels strangely inadequate if you are a bit of a hoarder (why throw out a nice outfit that you might want to wear someday if you want to look good for a movie cover...?).
I'm sure I can't be the only person who loves stockpiling a bunch of different gear (sure, I know that I save the designs and can use the sewing machine to make new clothes) but I would be very happy to have additional unlockable space so I can organize all my clothes (I had to throw away a bunch of panties and outfits the other day ).
So if it is mechanically possible to add another unlockable slot (or even more...) I'd be really thrilled.