They say that fashion is cyclical, like there's some magical cycle that pops back up totally randomly- like poof! The 80's are in. Poof! Kitten heels are no longer ugly!
I'd say it's a little more complicated than that.
Like, why is it ok to look like MC Hammer totally seriously? Actually: side note: I have found myself looking like a part of a British 80's girl rap group pretty often lately.
Fashion is cyclical because certain values that we identified with at that time were manifested into the clothes of the time and those values have surfaced again in society. We only know so many ways to outwardly identify the way we feel inside, not to be over simplistic or Hallmarkesque.
So why is it ok to look like these silly pictures above? Well, that's anyones guess, it's probably another over simplistic response, it has something to do with the recession.