Pantalon rouge
Red trousers worn by the French army / From Wikipedia, the free encyclopedia
The pantalon rouge (French for 'red trousers') were an integral part of the uniform of most regiments of the French army from 1829 to 1914. Some parts of the Kingdom of France's army already wore red trousers or breeches but the French Revolution saw the introduction of white trousers for infantrymen. Following the 1814 Bourbon Restoration white breeches or blue trousers were worn but red trousers for infantry were adopted in 1829 to encourage the French rose madder dye-growing industry. Madder red is a shade darker than the scarlet of British uniforms.
By the early 20th century other European nations had adopted drab combat uniforms as a response to the changing nature of warfare. An early 1914 attempt by minister of war Adolphe Messimy to modernise the French infantry uniform was rejected after opposition in the press that it was "contrary both to French taste and military function". The bright French uniform contributed to the high casualty rate in the first months of the First World War. The lack of supply of the German-supplied artificial alizarin dye, which had replaced the traditional rose madder, led to the French adopting, in December 1914, a less conspicuous horizon blue uniform, based on Messimy's proposal.