With the massive arrangement of hair at the back of the head in the late 1860s and early 1870s, bonnets had to be worn further forward, the front curving fronijust above the hair-line to behind the ears where the ribbons were attached, the back cut away to allow the hair to flow freely. At this time hats were also perched on the forehead; a pillbox shape is sometimes referred to as a casquette, a name also applied to a hat following the lines of the Scotch glengarry cap.
ca 1885: Clothing requirements for most sporting remained strict towards retaining foundation garments such as corsets and bustle, which were thought to stabilize women's frail and weak forms. This example would have been worn for tennis, yachting or general seaside walking.
fashion plate 1801-02 from the collection of the Bibliothèque des Arts Décoratifs, on flickr by SceneInThePast