Hannah Hammond wears only black to cut decision fatigue. She owns multiple identical black shirts, pants, and blazers so she can grab an outfit in seconds instead of spending mental energy coordinating clothes every morning.
Hey Hannah, why do you always wear black? The main reason I wear black is because every single minute is such an important minute. It's our most valuable resource is time, and I don't like to have to wake up and try to coordinate a different outfit every single day. So I just try to keep it super simple. I've got multiple pairs of the same black shirts, the same black pants or some variation of it, a few black dresses, a few black blazers, some black yoga pants, and it keeps it super simple. I just grab something, put it on, and it saves me a lot of time and headache trying to coordinate every single day.