It's an interesting theory - if you use your brainpower early in the day figuring out what to wear, you'll have less of it later in the day for making important decisions. It's known as "decision fatigue." That's why some super successful people like Barack Obama and Mark Zuckerberg have kind of dull wardrobes.
John Tierney, coauthor of the New York Times bestselling book “Willpower,” says,
Decision fatigue helps explain why ordinarily sensible people get angry at colleagues and families, splurge on clothes, buy junk food at the supermarket and can’t resist the dealer’s offer to rustproof their new car. No matter how rational and high-minded you try to be, you can’t make decision after decision without paying a biological price. It’s different from ordinary physical fatigue - you’re not consciously aware of being tired - but you’re low on mental energy.
Sounds like a good idea to me! Now if I could just figure out what my "uniform" is gonna be.