Concerning the clothing worn Abyssinian Scouts, I found this passage in Ernestine Sartorius's booklet "Three Months in the Soudan", and thought I would share it.
"While my husband, who happened for the moment to be in Mr. Wylde's house, was giving orders about the embarkation of more troops for the front, his aide-de-camp, Captain Goodall, came into the room, looking much amused, and reported that the Abyssinians would not be clothed, explaining further that on being shown trousers they almost mutinied. It appears that, their original dress being very dirty, they had been sent down to get uniform, but that they objected to anything but their customary loose style of clothing. These Abyssinians, twenty-four in number, were all Christians, and came to us from Massowah as volunteers. They are a handsome-looking, copper-coloured race, but quite as savage as the Arabs outside. Nobody speaks their language, and it was therefore only by their horrified gestures, and the faces they made, that one could understand the disgust they felt at the idea of putting on the coarse white trousers of the Egyptian soldier. This indignation was further increased at the sight of the shoes. They had to have their own way at last, for they made us understand that they could not move about with such things on; that they came to fight, but not to wear trousers and boots."
It does appear the attempt was made at first to uniform them in the Egyptian field uniform.
Billy Fish: He wants to know if you are gods.
Peachy Carnehan: Not gods - Englishmen. The next best thing.