More outfit slots.
Learning: Clothing worn while studying skills or sitting in class
Combat: Clothing worn for fights and duels
Uniform: Clothing worn for work
Costume: The costume worn for costumed evens
There could also be blank slots that you can name for yourself and designate what activities you wear them in. For example, being able to designate the wet suit and flippers for "swimming in the ocean" so you don't have to make that your regular swimming outfit and look like a dork when you get in the hot tub. Or you could specifically designate your tuxedo for "Weddings" so you aren't overdressed when you stop by the office. This would save us a lot of paused time editing our sims in CC.