helmet was often substituted. Beginning with the Second Anglo-Afghan War of 1878, the British Army began adopting light khaki uniforms for Tropical service that was first introduced in 1848 with the Corps of Guides in India. This innovation arose from experience fighting irregular forces in India, for example on the Indian North-West Frontier and during the Indian Mutiny, and in Africa during the Anglo-Zulu War, as well as the invention of smokeless gunpowder and the increasing effectiveness and usage of rifles. In 1902 a darker shade of Service Dress (SD) was adopted for field and ordinary use in Britain itself. The scarlet, blue and rifle green uniforms were retained for wear as full dress on parade and "walking-out dress" when off duty and out of barracks. As worn between 1902 and 1914 by all non-commissioned ranks, walking-out dress was essentially the same as review order, except that a peaked cap or glengarry was worn instead of the full dress headdress and overalls (strapped trousers) were substituted for cavalry breeches. When khaki web carrying equipment was introduced, the earlier, white or black leather carrying equipment was retained for wear with the dress uniform. As with the earlier uniforms, the officers' uniforms differed in quality and detail from those worn by the Other Ranks. Officers purchased their own dress uniforms from regimentally approved tailors while other ranks were issued all orders of dress from government stocks. With the outbreak of World War I in August 1914 all full dress and other coloured uniforms ceased to be worn by the British Army. After 1919 they were restored to the Household Cavalry and Foot Guard for ceremonial purposes but not to the bulk of the army. Officers were authorised to wear full dress for certain special occasions such as Court levees (formal presentations to the Monarch) and it was customary to wear these uniforms at social functions such as weddings. By 1928 bands were wearing full dress on occasions where they were not parading with the remainder of the regiment (who had only khaki service dress). The pre-1914 dress uniforms were still held in store and occasionally reappeared for historic displays. However, there was no serious attempt to make them general issue again, primarily for reasons of expense. When (khaki) Battle Dress (BD) uniforms, which had a short blouse instead of a tunic, were adopted immediately before the Second World War, the older khaki