What he knew about decision making that most people don’t.
Everyday we make a bunch of choices. It starts in the morning with hitting the snooze button (or not) and continues from there. What should I eat? When should I leave for work? When should I have lunch? Should I speak up at the team meeting? Should I go to the gym? Etc.
The funny thing with decisions is that when you make them, you actually expend mental energy. If you make too many decisions in too short a time frame, you significantly reduce your decision-making ability.
This is known as decision fatigue.
Steve Jobs famously wore the same black turtleneck, blue jeans and New Balance sneakers everyday. It quickly became his trademark look. When you think about the co-founder and (former) CEO of the most valuable company in the world wearing the same outfit everyday, it’s pretty clear that Steve understood he had a finite capacity to make excellent decisions.
It really comes down to this — was it more important for him to choose a t-shirt for the day or how interactions would work on the next version of the iPhone? When put in such a simple example, it makes sense that he would wear the same outfit everyday — it was one more decision he could put towards making Apple’s products legendary.