Back in my day, we called them coulottes. They had big, comfortable legs. They were more comfortable than a skirt. You could wear them for play or for dress, depending on how they looked. Some were shorter, some were longer. Now they call them gauchos. I really can't see any difference other than the name.
The one that cracks me up is pedal pushers. We wore them growing up and we loved them. They were all the rage. But let your kids see a picture of you in pedal pushers and here you say that name and they die laughing. But in the late 70's to mid 80's, they reappeared as crop pants. EVERYBODY had to have a pair. They were THE thing to dress up in. I remember my daughter and I having crop pants and you just HAD to wear them with jelly shoes (remember those). That fad faded and was buried away. Crop pants were no longer "the thing." Now, here we are in the 21st century with Capri pants. Is it just me or are we right back to pedal pushers again? I can't see a big difference.
I didn't even cover mini-skirts, the midi, hot pants vs. daisy dukes. But you get my drift. The very things we saw our mothers wearing in public are the very things we rush out and buy off the rack. I even saw some flip flops this year that are made out of the jelly shoe material.
Do designers really think they have come up with a new fad or do they just sit around looking at old photos until somebody says, "Check this out. Pedal pushers. Hey, let's reinvent those and call them capri pants."
I've often heard the saying "The more things change, the more they remain the same." If you don't believe that, look at fashions.