A black midi dress for a Christmas party is sophisticated and practical in equal measure. The midi length reads as more formal than a mini without requiring the commitment of a full gown. Black works in almost every room temperature situation and pairs with any shoe or accessory you already own. A structured black midi dress shows you took the party seriously without looking like you tried too hard. The length is forgiving in ways that shorter dresses cannot be. You can sit, stand, walk without constantly thinking about coverage. Pair it with heels for formality or boots for something less stiff. These are the black midi dresses that work because they are straightforward and they work.