It’s not formal but certainly not casualmaking the risk of doing too much or too little pretty high.
What is cocktail attire?
During theEdwardian era, women’s dress was elaborate, including corsets, long skirts, and layers.

Photo: Courtesy of Everett Collection
“They offered luxurious loungy dressing for hostesses of private, high-class cocktail gatherings.
Paris couturiers always have been an important source for U.S. fashion industry since the 19th century.
What does cocktail attire look like today?
But there are some key rules to keep in mind.
When it comes to dresses, the length can depend on the style.
And a shorter dress can also work but keep the occasion in mind with the length.
For example, some cocktail parties or events may specify that they would like guests to wear all black.
Cocktail attire offers some leniency when it comes to suiting.
In some cases, though, a suit could be worn with a simple T-shirt.
What shoes are appropriate cocktail attire?
Typically any form of dress shoes are considered cocktail attire appropriate.
For women thats often heels, leather flats or even a heeled boot.
For men, that can be a loafer or a dressy boot.
Still, its important to consider the host and the event.