A mobcap is a round, gathered or pleated cloth bonnet consisting of a caul to cover the hair, a frilled or ruffled brim, and a ribbon band, worn by married women in the 18th and early 19th centuries,
Simple American bonnet or mobcap, in a portrait by Benjamin Greenleaf, 1805
A portrait by English landscape and portrait painter, Joseph Wright of Derby, of an unidentified woman sporting a large mobcap