Uniforms of the French Army, circa 1876

Uniforms of the French Army from Paul Lacroix's The Eighteenth Century: Its Institutions, Customs, and Costumes, France 1700-1789. 

Army dress was fairly standardized, but it was not until later in the century that a uniform code would come into existence. Officers usually bought their own clothes since they came predominantly from the upper classes, so their attire was more extravagant than that of the foot soldiers. As the army became regimented, regulations for dress were laid out to distinguish between regiments. Within a regiment there were often variations in attire between infantrymen, calvary, artillery, etc. 

Paul Lacroix (1806-1884) was a prolific and varied writer, best known under the pen name P. L. Jacob. He wrote more than twenty historical romances, as well as serious historical works. In collaboration with Ferdinand Sere he co-wrote Le Moyen Age et la Renaissance, published in 1847. Lacroix wrote a number of works focusing on the customs and manners of different phases in history. His interest in libraries and dedication to writing lead to his appointment as librarian of the Arsenal Library in Paris. 

The Eighteenth Century: Its Institutions, Customs, and Costumes, France 1700-1789 was illustrated with twenty-one chromolithographs and three hundred fifty woodblock engravings. They were executed by artists and engravers under the direction of M. Racinet. Many of the images are after paintings and engravings by eminent French artists, such as Watteau, Rigaud, Boucher, Chardin, etc.