They formed in the late 70s.
Vaguely ironic retro-psychedelia was still fashionable in the 90s.
That's not the same thing as twenty year cycles.
In the 50s there were teds, who dressed in an Edwardian style, which is at least a 40 year gap.
(
_Felix 's school of dance and occult sciences,
Sat 7 Feb 2009, 15:01,
archived)
OK well think of the music at that time
Very influenced by the 70's. Today it is the 80's with undertones of the 60's.
(
riverghost servicing your mum since,
Sat 7 Feb 2009, 15:04,
archived)