1809 Blue Redingote, French. Back view of walking coat with military style trim, upstanding collar, white hat, black shoes and a handkerchief. Fashion Plate via  Journal des Dames et des Modes, or Costume Parisien.

Redingotes or Pelisses were needed to cover the flimsy dresses made of lightweight fabrics of the Regency years to provide warmth and some protection from windy conditions when gowns might lift and cause modesty issues. Jane Austen and her contemporaries often walked to places and so would have needed the warmth of a Pelisse or coat in the cold British winters.

In Europe, a Redingote was a coat or robe like garment worn both indoors and out, indoors left open to reveal a dress while the outdoor version was made of heavier materials and of darker colors than the type worn indoors. The name comes from the term ‘riding coat.’