A black crepe dress for a funeral needs to be about the fabric and the cut and nothing else. Crepe has weight and drape that actually means something. The structured quality of crepe says respect without saying anything at all. These dresses should be simple in construction and dark enough that the fabric does the talking rather than the style. A midi or knee length works depending on your instinct about formality. Sleeves matter. Long sleeves or three-quarter sleeves feel appropriate and the coverage gives you somewhere to put your hands if you need to. The fit should be defined enough that you look like you got dressed for something important but not so fitted that you look like you are performing. These are the dresses that hold you up when you need to hold it together.