I have only a few things I wear until I lose some weight, so I never really need to plan outfits. But I do plan my day to a certain degree. Going to do x, y, and z today and a, b, and c tomorrow. I have a monthly calendar to keep everything organized like when homework is due, when I'm volunteering, when my tests are, the car club meetings, social events, etc. With homework and studying now I always plan ahead when I'm doing what and what I'm doing with my free time at school. Food depends. Usually day of, sometimes I do a menu

I do plan how I eat though, which I just learned recently is not normal. Like when I have a plate of food, I'm planning how many bites of one thing I'll take, how many bites of the next thing, the order in which I finish each thing, etc