 Zip up Polar fleeces, originally invented during the 1970s for use by meat packing plant workers in the large refrigerated units, are also commonly worn by factory workers, barrow boys and stock handlers in colder climates.During the 1980s, workwear such as the donkey jacket and Doc Martens safety boots were popular street attire for British skinheads, suedeheads, hardcore punks and football hooligans.More recently, Celtic punk groups such as Dropkick Murphys have adopted aspects of the look such as the flat cap to assert their working class Irish identity.