I think Japanese fashion is less about the clothes themselves than the acceptance to let people wear what they want and and not judging. I think it’s more acceptable to match different colors and styles.
One strap shoulder Man-bags are all the rage. They are pretty practical, especially when you can’t fit your checkbook-sized wallet in tiny pockets. But in the US it looks like you’re wearing a fanny pack.
If you saw someone wearing an all yellow track suit it would look OK, partly because someone wearing an all green version is 20 feet away.
Or business slacks tapered and cropped above the ankle — in the US they’d ask, “is there a flood?”
While the clothes themselves don’t seem much different, I prefer slimmer cuts. The US is too baggy and loose.