Worn by Jackie Kennedy Onassis, the cocktail dress is also a ball room favorite. Worn with diamonds or pearls, the fancy cocktail sheath is a classic that reminds of that Breakfast at Tiffany's was only won in this contemporary replacement of a gown. Haute couture maven, or downtown doll, the wearer of the black cocktail dress is the most princess of all. Pair a strapless cocktail sheath or sheer A-line dress with patent leather sandals or classic pumps. Adorned to the hilt, the simple cocktail is forever respected as an understated style.