Official prom dresses are the most formal dress of the week, according to an official dress code for dress codes of major European countries.
It says official dresses must be made of silk or linen, and can have buttons, bows and a bow tie.
The official dress codes for France, Germany, Italy, Spain, Britain, Canada and the Netherlands apply to all of the world’s major countries, as well as for small, medium and large cities in the European Union.
The European Union states that formal dresses must not be overly formal or be made with a particular material or style.
“The dress code does not allow for the consumption of alcohol or drugs, or for people with certain illnesses or disabilities,” it said.
In a statement, the British Council said the dress code was a compromise between the “inclusive nature of the dress codes” and the “respect for tradition and dress codes that are more suited to the times.”
Dress codes of smaller countries can vary from country to country.
The US government said it has not yet decided whether to implement the dresscode in the United Kingdom.