a loose, full back of a woman's gown, formed by wide box pleats hanging from a high shoulder yoke and extending to the hem in an unbroken line.
Origin of Watteau back
First recorded in 1895–1900; after a type of gown depicted in paintings by Watteau
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a section at the back of a woman's dress that is caught in pleats or gathers at the neck and falls unbelted to the floor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012