I think that when you get dressed in the morning sometimes you're really making a decision about your behavior for the day. Like if you put on flipflops you're saying: 'Hope I don't get chased today.' 'Be nice to people in sneakers.'
No one ever pretended that shopping for anything is a rational experience. If it were would there be Fluffernutter? Laceless sneakers? Porkpie hats? Would the Chia Pet even exist?