One of the mysteries of the English language finally explained.
A broad-brimmed hat with a flat crown, originally of straw and frequently trimmed with ribbons or flowers.
Early 19th century; earliest use found in Morning Post Gazetteer. From Pamela, the name of the eponymous heroine of Samuel Richardson's novel, who is described as wearing a hat in this style + hat, perhaps after French † chapeau de Paméla, † chapeau à la Paméla (although this is apparently first attested slightly later than in English: 1806).
Pamela hat/ˌpam(ɪ)lə ˈhat//ˌpam(ə)lə ˈhat/
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