We keep on top of washing clothes all week, and getting them dry. But as a FT working household, we only fold them once a week (on a Saturday evening watching a movie - it's become a family job doing it together).
In the meantime, apart from having plenty of sets of things, everyone knows that if what they want isn't in their room or the hot press, it may be in the clean laundry basket in the kitchen, so checks there as well. So if DD has a hockey match on Monday but needs her long socks again for a soccer match on Friday in school, they can get washed and back in circulation but just haven't made it up to her room yet. And she knows exactly where to look.
We are also big on getting ready ahead of time. So packing bags the night before and getting breakfasts laid out on the worktop, lunches made etc before we go to bed.
I must re-do them for this year, but last year, we had a different laminated A5 sheet for each day of the week with what was needed for the bags (different activities needed different things - gumshields, long socks, shin guards, hockey stick, hurley, swim gear, boating gear, water bottle, Cubs neckerchief, .......). DD could easily get organized herself, and because it was laminated (for durability), the bonus was that we could use wipable markers (for whiteboards etc) to tick things off as they went into bags each week and then clean it off again for the next time.
The other big thing is a family diary clearly visible in the kitchen (ours is a book-type on the counter, we find that easier than a wall one). To all be able to see what is happening that week. Regular activities, who is abroad or has early/late meetings for work, irregular appointments, social commitments, babysitters booked, birthdays/anniversaries etc.