Various definitions of skinheads:

Skinhead: Aggressively working-class puritans in big industrial boots, jeans rolled up high to reveal them, hair cut to the skull, braces and a violence and racism earned for them the title ‘bovver boys’, ‘bootboys’.
Skinhead definition by Michael Brake in his book Comparative youth culture.

Skinhead; skin: A member of a youth fashion and gang movement, characterised by close-cropped or shaven scalp and smart utilitarian wear, associated with football hooliganism, racist violence and neo-Nazism. Early in the 1970s Richard Allen, a pseudonym of James Moffat (1922–93), published a series of ‘youthsploitation’ novels under the general title Skinhead UK, 1969.
Skinhead definition by The Concise New Partridge Dictionary of Slang and Unconventional English

skinhead logo

The skinheads are an international politico-cultural youth movement with a crude white racist and Nazi ideology. They are recognizable by their shaven heads, steel-toed boots, and tattoos, and they listen to what they call “Oi” music.
Skinhead definition by Stephen D. Shenfield in his book Russian fascism