vers 1750
Women’s riding outfits, known as ‘riding habits’, of the 18th century adapted elements of men’s dress. This jacket of the 1750s is styled after a man’s coat, although it has been modified with a waist seam to fit over stays and a wide petticoat. Another masculine element is the mariner’s cuff, with a scalloped flap running parallel to the length of the sleeve. It was a style first seen on the coats of naval officers, although their uniform was not officially defined until 1748. The mariner’s cuff became a fashionable feature of civilian coats in the 1750s and soon began to appear on women’s riding habits.
http://collections.vam.ac.uk/item/O115762/riding-coat-unknown/
Worsted, lined with linen and silk