did this movement have any association with an island?
Yes, the first camp was organized on the Brownsea Island.
Scouting
In mid-1907 Baden-Powell held a camp on Brownsea Island in England to test ideas for his book. 
describe five different scouting organizations within the scouting movement Club Scout, Boy Scout, Rover Scout,  Girl Guides etc. when did this start? A camp in the mid -1907 and publication of a book in 1908 are regarded as the start of the Scout movement. did they have specific attire? The original uniform, still widely recognized, consisted of a khaki button-up shirt, shorts, and a broad-brimmed campaign hat.  Uniform shirts are now frequently blue, orange, red or green and shorts are frequently replaced by long trousers all year or only under cold weather. what is the third type mentioned above? A campaign hat, sometimes called campaign cover, is a broad-brimmed felt or straw hat, with a high crown, pinched symmetrically at the four corners.
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Scouting [SEP] Introduction
In mid-1907 Baden-Powell held a camp on Brownsea Island in England to test ideas for his book. This camp and the publication of "Scouting for Boys" (London, 1908) are generally regarded as the start of the Scout movement. The movement employs the Scout method, a programme of informal education with an emphasis on practical outdoor activities, including camping, woodcraft, aquatics, hiking, backpacking, and sports. Another widely recognized movement characteristic is the Scout uniform, by intent hiding all differences of social standing in a country and making for equality, with neckerchief and campaign hat or comparable headwear. Distinctive uniform insignia include the fleur-de-lis and the trefoil, as well as badges and other patches.