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In Western clothing, Semi-formal is a grouping of dress codes, indicating the sort of clothes worn to events with a level of formality between informal (i.e. lounge suit) and formal.[1] Historically there were both day and evening semi-formal dress codes, but this category is now seen almost exclusively in the context of evening wear.

A cocktail dress or cocktail gown is a woman's dress worn at cocktail parties, and semi-formal occasions.
The length of cocktail dresses varies depending on fashion and local custom. The length ranges from just above the knee to touching the ankle. When it is about 5 cm (2 inches) above the ankle it is called tea length and when it is almost touching the ankle it is called ballerina length, although ballerina length dresses usually fall into the evening gown category.

At semi-formal occasions, less elaborate, shorter-length cocktail dresses may be worn. Prior to the mid 20th century this type of dress was known as 'late afternoon'. When gentlemen are in business suits, ladies also wear dress suits or "good" afternoon skirt and dresses.

By the 1980s a dress was considered to be cocktail less by where the hem fell, but more by the level of sumptuousness the garment attained.

In the mid-20th century, some couturiers began describing full-skirted cocktail gowns as "dancing costumes". These are suitable for formal dances but not for balls, or other white tie affairs, where ball gowns are worn.

Christian Dior was the first to use the term "cocktail dress" to refer to early evening wear, in the late 1940s