Tie-Strap Long Black Formal Dress: Mac Duggal 49620Sleek and so classy, this long black sweetheart formal dress 4962 by Mac Duggal is as beautiful as it is glamorous. With a fold over sweetheart neckline, this long black evening gown gets a stylish upgrade with wide shoulder straps that tie into bows before leading to the low square back. The long black dance dress has a hip hugging long skirt that opens in a side slit before ending at the floor for a look of drama. Elevate your evening look by