I'm not a planner by nature. But like Unfrumped, I've attempted to turn myself into one when it comes to outfits since I need to get up and out the door in the mornings and I'm NOT a morning person. My efforts have def been stop and go over the last several years.
Ironically I do better planning a week at a time (with putting out 7-8 options for a 5-day work week so I can be a mood dresser to some extent) than a night ahead.
When I do it I aim to hang EVERYTHING needed -- from what goes under to shoes to jewelry to tights to shoes etc. It's needed as tend to be That Person who oops, forgot the laundry never made it into the dryer, or can't find the sweater I was planning to wear even though I just saw it somewhere, or [fill in the blank] -- and I go from running early/on time to running, period.
When I don't plan I generally have a get up, decide on spur of moment, take 2 minutes to pick out stuff that I know works together (due to prior try-ons/wears) system. But somehow there always seems to be that one missing element that adds time....