The emblematic colour of the Poilus (French infantrymen) of 1914-18, horizon blue had to wait until the first weeks of 1915 before appearing on the French uniforms. Aiming to be reminiscent of the blue line of the Vosges - the natural frontier between the annexed Alsace and Lorraine – this indigo based dye replaced the red parts of the previous outfit, an easy target for new enemy machine guns. Working with the principal that the soldiers would thus be hidden with the line of the horizon, the French state decided to adopt this nuance after ten years of various trials. It was replaced by khaki in 1935.
Flannel is combed wool or cotton fabric, which appeared in the 18th century coinciding with the introduction of the first looms. An imperishable classic in English drapery, this warm fabric with a slight fuzz (due to washing at the end of the production process) permits the elegant man to face the winter months without shivering.