There's a reason for that: Our brains actually have a set amount of thinking power every day, and just like the battery in your phone or laptop, running unnecessary applications tends to wear that down. It's called decision fatigue, and it's a real problem among people whose job is to make decisions all day. Successful people minimize the number of trivial decisions they need to make every day in favor of more important ones. Even Barack Obama, when questioned about the fact that he tends to wear the same suit every day, admitted it's because he has "many other decisions to make."
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"I pick ... Uzbekistan. No! Wait! Bulgaria. Yeah, definitely Bulgaria."
"Very well, sir. Nuking Bulgaria."
Of course, this whole fashion thing is a lot easier when you're rich enough to employ either other people to make those decisions for you or other people to beat the s**t out of the people mocking your one outfit. Both methods are equally sound.