Cocktail dresses first began to emerge in the late 1920's. This was a time where women were increasing their visibility in social circles. Suddenly they were being invited to swanky lounges and elegant parties that centered on the idea of cocktails. During this time period White & Gold Short Strapless A-line La Femme 17107 Party Dress were typically short sheath dresses that had coordinating accessories. These parties typically happened between the hours of 6 and 8pm which required a bit of formality, but not full black tie attire.
As World War I drew to a close the American population was ready to celebrate life and women had fully embraced the simple elegance of cocktail dresses. In fact, the demand was so great that French designers who had only specialized in couture garments began to design for cocktail hour. These cocktail dresses stayed true to the sheath nature of designs of the past, but they also incorporated a chic design aesthetic to give hostesses and guests an elegant and fashion forward look.
Here's the details of the cocktail dresses as follow: http://www.girlshomecomingdresses.com/la-femme-dresses-c-1.html