Hardy Amies, perhaps the first men's clothing designer and the man who had more influence on my dress than any other, wrote that a man should select his clothes with care so he can forget about them for the rest of the day.
Choosing the day's clothes starts with the suit rotation. Suits are not meant to be worn on consecutive days, and one way to ensure that is to rotate them in the closet. I hang recently worn clothing on the right of one closet bar, and take clothes that I'm going to wear from the left side. Moving them along the bar isn't much of a job - I have quite a few suits but there are no more than a dozen in my active city rotation at any particular time.
I start my selection by considering the formality of the day I expect to have. If it's got at least one serious event, I'll choose the first serious suit at the left hand side of the bar. Or, if it promises to be less formal, I'll pull a Friday suit that's less somber.