Notes
"The calash bonnet was worn throughout the eighteenth and early nineteenth centuries for protection from both inclement weather, particularly wind, or sunny weather. It first came into use in the 1760s in the form of a supported, collapsible hood. This new style could protect the wearer, like its predecessor, the padded hood, without crushing the hair style, cap or headdress worn beneath."
(Source: https://sfcdyer.wordpress.com/2013/01/20/constructing-a-late-eighteenth-century-calash/)
Note included in file: "Calash bonnet worn by Miss Elizabeth B. Hart's great-great-grandmother. 1760. Given by Elizabeth B. Hart, June 8, 1912."