A long sleeve black dress is one of the few things in a wardrobe that genuinely works every single month of the year. Summer with sandals and sunglasses. Autumn under a leather jacket. Winter dressed up with heels and good jewelry. It never stops being useful. The problem is that most black dresses either show every crease, cling in the wrong places, or photograph like a void. We’ve been very deliberate about the ones we’ve chosen here. We wanted fabrics that move well and hold their shape, fits that are flattering without being restrictive, and sleeve lengths that actually cover the arm properly rather than stopping somewhere awkward. Some of these are polished enough for a work presentation. Some are relaxed enough for a weekend. Several could do both. We think the long sleeve black dress is the most underrated wardrobe investment available, and we’re prepared to argue that point. These are the ones that prove it.