
A ball gown is the most formal female attire for social occasions. It is traditionally a full-skirted gown reaching the floor, made of luxurious fabric, delicately and exotically trimmed. Most versions are cut off the shoulder with decollete necklines. Such gowns are typically worn with a stole (a formal shawl in expensive fabric), cape or cloak i...
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http://en.wikipedia.org/wiki/Ball_gown

Characterized by a very full skirt that begins at the waist and continues to a formal length. The skirt waist is seamed and can be of various styles.
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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.
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http://www.probertencyclopaedia.com/browse/PB.HTM

[
n] - the most formal gown
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http://www.webdictionary.co.uk/definition.php?query=ball%20gown
noun the most formal gown; worn to a ball
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https://www.encyclo.co.uk/local/20974

Characterized by a very full skirt that begins at the waist and continues to a formal length. The skirt waist is seamed and can be of various styles.
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https://www.encyclo.co.uk/local/23219
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