'Watteau back' definitions:

Definition of 'Watteau back'

From: GCIDE

Watteau back \Watteau back\ The back of a woman's gown in which one or more very broad folds are carried from the neck to the floor without being held in at the waist, while the front and sides of the gown are shaped to the person and have a belt or its equivalent. [Webster 1913 Suppl.]