From the press release:
History Museum Wins National Award
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.