A mob was undress headwear; becoming popular in the 1730s and worn in some form into the next century. It had a puffed crown placed high on the back of the head, a deep flat border surrounding the face, and side pieces carried down like short lappets, which could be left loose, pinned, or tied under the chin. The flat border usually was frilled or had lace.

A mob cap or mob-cap is a round, gathered or pleated cloth (usually linen) cap consisting of a caul to cover the hair, a frilled or ruffled brim, and (often) a ribbon band, worn by women in the Georgian period. Originally a lower-class style, the mob cap became a high-fashion item as part of the adoption of simple "country" clothing in the later 18th century. It was an indoor fashion, and was worn under a hat for outdoor wear.