South African Constabulary
After the siege of Mafeking and the end of the Anglo-Boer War, Britain had control of the former Boer republics of Transvaal and the Orange Free State. The South African Constabulary was established to be a peace-time army, somewhere between a police and a military force, to pacify the former republics which were now part of a united South Africa under British rule.
Baden-Powell was put in charge of the South African Constabulary, as a leader with exceptional ability to organize the force from scratch in a short time. He quickly recruited a force from the two British colonies, the Cape and Natal, which were now part of the Union of South Africa. He also recruited officers and men from Australia, New Zealand, Canada, India and Ceylon, England and Ireland.
B-P himself designed the uniform: an informal khaki shirt and his favourite `Boss of the Plains' broad-brimmed hat. It was less formal and more practical than the army uniform. B-P had always preferred comfortable frontier clothes.
Later when he established Scouting for boys, B-P used a very similar uniform, with khaki shirt and shorts, a scarf, and the famous broad-brimmed hat.
The original colours of the Scout emblem - gold on green - also came from the colours of the Transvaal.
Thousands of Scouts around the world wore this uniform, although there are very few who wear the same uniform today. South African contingents at World Jamboree's are always visible in their traditional Scout hats and khaki uniform, with the green-and-gold scarf.
Hillcourt, Baden-Powell: the two lives of a hero
Pakenham, The Anglo Boer War