They say fashion goes in cycles. That cycle is ~ 20 years to start and ~ 30!years to complete, the approximate time it takes for a generation of teenagers to raid their parents old shit. Which just so happen to hit the second hand market around the same time.
1984 -> 2004 -> 2024. Emo and goth cycles.
1964 -> 1984 -> 2004 -> 2024. First, second, third, and… fourth? waves of ska.