(Smartasses, I am not talking literally here.)
For me, it's mascara. I may be unshowered and unkempt, but I'm going to have the illusion of long lush lashes whenever I venture beyond my own mailbox. My hairdresser told of a client who could not leave home without polished fingernails. For some, it's earrings; others, a baseball cap. For a lot of us these days, it's a cell phone.
What's your thing?