belt with silver hardware (a new daily item I use as a finishing piece - is this an essential?)
black flat/low-heel shoes
fluid tees in neutral shades (navy, blush) (summer)
white jeans/shorts (summer)
white flats (Birkenstocks or sneakers) (summer)
I'm not sure where my outwear fits - I'm almost inclined to call it basic, since I only wear it out of absolute necessity. But, I would say dark blue outerwear, of which I have two pieces that are worn almost constantly in cold weather, would be the most essential item.