A ballerina skirt is a full skirt that reaches to just above the ankles. Ballerina skirts were popular during the 1950's and have long been popular as an alternative to a ball gown for young women. Research Ballerina Skirt
A ball gown is an elaborate, formal, woman's evening dress, often a full-skirted gown reaching at least to the ankles. Ball gowns are typically made from expensive fabric, usually satin, silk or taffeta, cut off the shoulder with a decollete neckline, and trimmed with lace, pearls, sequins and embroidery. Research Ball Gown
A cocktail dress is a woman's formal dress, not quite as formal as a ball gown and usually shorter, designed to be worn in early evening, such as at cocktail parties. Research Cocktail Dress
 
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