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Formal wear (US, Canada) and formal dress (UK) are general terms for clothing suitable for formal social events, such as a wedding, formal garden party or dinner, débutante cotillion, dance, or race. The Western style of formal evening dress, characterized by black and white garments, has spread through many countries; it is almost always the standard formal social dress in countries without a formal national costume.
A dress code is a set of rules governing a certain combination of clothing; some examples are black tie and morning dress. Formal dress is the grouping of all the dress codes which govern clothes worn to formal events. The traditional rules that govern men's formal dress are strictly observed; from these derive the evening dress variants worn on many occasions, such as high school prom dances, formal dances, and entertainment industry award programs.
The dress code considered formal in the evening is white tie. In the UK, morning dress is standard formal day time clothing (a lounge suit being still considered informal dress), but in the US/Canada morning dress is rare, having been replaced with the stroller and then the lounge, or business suit. Morning dress, however, does remain in certain settings in Europe, Australia, and Japan.
The continual relaxation of formal dress standards since the end of the Second World War is redefining what clothes constitute formal and semi-formal dress. The original term full dress was used in the 19th century and the early 20th century to mean the most formal option available, while half dress and undress ranked beneath it. They indicated different clothes, but correspond somewhat to the 21st-century structure of formal, semi-formal, and informal. These are the terms used by traditional etiquette and dress consultants (especially for weddings), while contemporary consultants use looser, modern definitions, in which white tie is styled as most formal, very formal or ultra formal; black tie as formal; and the traditionally informal lounge suit as pseudo-formal. Moreover, modern advisers recommend black tie for events traditionally considered to require formal dress (white tie), and alternatives for what would have been semi-formal events.
However, formal and semi-formal are unambiguous when it is known they are being used in a traditional setting, even though changing fashions can make these terms ambiguous; white tie and black tie on the other hand refer solely to the combination of relevant clothes themselves, regardless of their setting, and so are much less susceptible to misinterpretation.
Particularly in America, but also around the Western world, there has also been a relaxation regarding the dress codes themselves, with full formal dress (white tie or morning dress) almost unheard of in many places. An example of such a variant is removing the traditional, classic black bow tie required by the black tie dress code in favour of a black or coloured regular tie and waistcoat, a development which would have been unthinkable just a few decades ago.
The clothes dictated by these dress codes for women are ball gowns. For many uniforms, the official clothing is unisex. Examples of this are law court dress, academic and graduate dress, formal military uniforms and formal military evening dress.
Women wear a variety of dresses. See ball gowns, evening gowns, and wedding dresses. Business attire for women has a developmental history of its own and generally looks different from formal dress for social occasions.
An Icelandic man wears the hátíðarbúningur formal dress on his wedding day along with a boutonnière
Couple married in a Shinto ceremony in Takayama, Gifu prefecture
King Abdullah in Arab formal dress
In Western formal state ceremonies and social functions, diplomats, foreign dignitaries, and guests of honour wear Western formal dress if not wearing their own national dress.
Many cultures have formal evening and day dress, for example:
Men's formal evening wear, or white tie, in 1912
Mustafa Kemal Atatürk in evening formal wear, in 1923
Morning dress in 1901
Men in morning formal wear
For more information re formal wear clothing, please click on the following link: http://en.wikipedia.org/wiki/Formal_wear