The cocktail dress is one of the most versatile garments available to women. Sometimes known as a cocktail gown, this style defines a semi-formal dress that’s perfect for parties and black tie occasions. The cocktail dress has a hemline that ranges from above the knee to the ankle. Modern variants on the cocktail dress usually have hemlines that fall around the knee; gowns with hems that brush the ankle are usually considered maxi-dresses or evening gowns.

Variations on this semi-formal style have existed since the 1920s. In the beginning, these gowns were considered “late afternoon” attire. Christian Dior pioneered the use of the term “cocktail dress” in the late 1940s to describe the stylish outfits that women donned in the early evening. Since this was the time of day that work ended and cocktail drinking began, the term stuck as a succinct description of the style.
By the mid-20th century, cocktail dresses were sold as ideal costumes for semi-formal dances. While the short hemlines made these garments unsuitable for balls and formal dances, they caught on as party clothing. Full-skirted gowns looked elegant without restricting dancers’ legs.
By the 1980s, the cocktail dress had become a nearly ubiquitous style for semi-formal events. While short hemlines were worn during all hours of the day, the cocktail dress was still recognisable as a stylish and chic outfit. Modern cocktail dresses are recognisable not only by their length but the materials they are made with. While casual skirts are made of comfortable materials like cotton, denim and rough-spun wool, cocktail dresses are generally considered to be constructed of higher-quality fabrics. These gowns may include brocade, silk, superfine wool, metallic cloth, lace, satin, velvet and synthetic fabrics. Instead of creating a garment that is designed to be worn all day, modern designers strive to create variants on the cocktail dress that look sumptuous without the stiff formality of evening wear.

While some modern cocktail dresses may retail for hundreds or even thousands of pounds, variations on these iconic designs can be found so cheaply that many women consider them to be a wardrobe staple. The “little black dress” refers to a monochromatic cocktail dress that can serve as the basis for a wide range of outfits. Countless fashion magazine spreads have been dedicated to variations on this style. Because the outfit itself is stylish and versatile, it can be “dressed up” with bold jewellery or “dressed down” with leggings, coats and understated makeup.
Because modern synthetic fabrics can precisely replicate the look and feel of expensive materials, designers have become freer to experiment with trendy styles of cocktail dress. A rayon, nylon or polyester dress might sell for less than £50 while replicating the look of the latest runway styles. Women can go beyond the little black dress and buy a cocktail dress in every colour of the rainbow. Prints, patterns, beads and sequins have become popular additions to the modern cocktail dress.
Some women have taken the recent resurgence in vintage couture to heart by seeking out cocktail gowns from decades past. The popularity of vintage cocktail dresses is a testament to the enduring elegance of this iconic style. While the outfits in vintage shops might have been sewn half a century ago, their sleek lines and unrestrictive hemlines still look as stylish as ever.