Although highly traditional, ecclesiastic dress did vary over time.  The short miters of the 12th century gave way to taller and more ornate models of the late Middle Ages.  Frequently the mitre was embellished with pearls or other jewels and richly embroidered.  Jan van Eyck's painting of the Madonna of the Canon van der Paele (1436), Bruges, shows St. Donation wearing the mitre and cope (a long cape) then part of the church treasury that was worn on feast days of the saint.  (Viollet-le-Duc, Mobilier 4:143) back to "worship"