I am a casual dresser. I can dress down at work, and I live in bootcut jeans, hoodies, and either sneakers or platform boots.
A few nice pieces that you can mix/match is the way to go! A few nice dress pants (or skirts; I myself am not much for skirts.) And tops that you can wear in layers, so that if you're indoors and you get hot or cold, you can add or remove a layer.
I admit to living in pajama pants and tees around the house. No reason to dress up.. the horses and snakes don't care as long as I am feeding or cleaning their homes
BLACK; you can't go wrong. No one can. Black dress pants, boots.. tops..