More to explore:
Fashion plate, 1780’s Katherina's plumed hat
A Most Beguiling Accomplishment: Galerie des Modes, 8e Cahier, 2e Figure (1778). Caption & long description translated by @Cassidy. "Young Lady in a Circassienne trimmed with blonde lace, decorated with a streaked ribbon, wearing a romantic Hat and a loose, braided chignon... Of all the beauties which decorate the seraglio of the Grand Seigneur, there are none that rival those who come from Circassia. One would be tempted to believe that in that happy country, nature takes pleasure in..."