From the press release:
Exhibit of Rare Spanish Documents Makes its U.S. Debut
Cavalry Uniform Design Drawn by Ramón Murillo, August 26, 1804
Mounted forces stationed along the northern frontier of New Spain were known as “leather-jacket” soldiers because of the multi-layered leather coats they wore instead of armour.
Manuscript, gouache in colors, paper.
Usage: Restrictions
Credit: Sevilla. Archivo General de Indias. MP-Uniformes, 81.
Note: Representative image at left is often cropped for display purposes. Downloaded high-resolution images are not cropped.