@La Pedestrienne - FWIW, I wore a fair amount of black when I was in the workforce. I found the commute to work, the pedestrian traffic, busy work office with many people, window shopping during lunch hour, etc - was very stimulating - maybe over stimulating. Black or mostly neutral clothes had a way of being a ‘calm in a storm’. When I retired, my life was much less stressful, and my environment comfortable, safe, and neutral. That is when I embraced colour! Interestingly, when I travelled, I fell back on a mostly neutral palette of garments. Probably because of the stimulation of experiencing new things.
I would submit that less black/more colour, is one way to provide sensory stimulation in a routine that has become mundane and lacking in excitement. Cooking, gardening, home decor, nature walks, bath and body products are all seeing an uptick - and, they are all ways to stimulate the senses.