The British Army during the First World War fought the largest and most costly war in its long history. Unlike the French and German Armies, the British Army was made up exclusively of volunteers as opposed to conscripts at the beginning of the conflict. Furthermore, the British Army was considerably smaller than its French and German counterparts.
For warm climates the British soldier had khaki drill ('KD') service dress, basically a jacket and trousers similar to ordinary service dress but made in the lighter cotton drill material. Though initially unofficial, shorts were often worn in place of trousers, and the lower legs were covered by puttees and short boots as they were in normal dress. The most obvious element of tropical dress was the helmet, known by various names including the Wolseley, sun helmet and the foreign service helmet. This had a wider brim to protect the head from the sun, and ventilation in the crown.