None. I look back at 80s fashion and I don't find anything wrong with it. It was the clothing of the time...Anything of its' time can be found to be bad. Hell, I was annoyed by the flannel trend of the 90s, but then I realized that that was what was popular at the time. If you're going to regret something, regret degrading terms hurled at the ones you love, or regret the slights that you gave to the personalities, the likes and the souls of those who you care for.
Legwarmers, hot pants, big hair, who cares? I thought that everybody looked great in the 80s, and you can quote me on that.