What happened to guys' pants?

Great! When did this happen? First time I noticed in men's fashion they wore trousers that are clearly too short. It would be interesting to look out for who are doing this here.

You can buy this for $19.90 off Qoo10 which is shipped from Korea.

Update: 5:50pm

I was told that the Beatles started this way back in the 60s. Did my parents make my brother and I do the same? I remember at one point my mom bought us purple pants.