During the Georgian period (1714-1837) the bonnet became high fashion among the middle class and even aristocracy. Then during the French Revolution, the name “Mob Cap” came into being when the poorer women who were involved in the riots wore them. By the Victorian period (1837-1901), faded from the upper classes, but lingered as the head covering of servants and nurses only smaller and plainer.
Mercy Wheeler’s sister-in-law made Mercy’s mob caps with the ruffle fuller and wider to cover the scar on the left side of her face.
I find it interesting that the mob cap is worn today in the pharmaceutical industry, in clean rooms, and other industries where hair has to be contained. The caps are usually a simple circle with an elastic band and usually easily disposable.