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Some kids fashion reverts back to some of the older fashions of almost half a century ago.
The older styles have a tendency to become popular again after thirty or forty years making them the "in" thing to wear. As with most fashions, they generally follow the fads that are popular at the time which dies out after a few years.
Most of the fashions for kids today are re-vamped styles from over fifty years ago. For instance, Capri pants are extremely popular just like they were in the 1940's. Straight leg jeans are also popular like back in the 50's. If you like a style and it goes out, just wait a while, it will come back in style.
Although kids fashion greatly depends on the popularity of stars and cartoon characters, it also depends on past fashions. Parents used to be able to hand down clothes that a sibling wore the year before but today that is not possible. The styles change so rapidly that the clothes are out of style before they can be handed down.
This costs parents millions of dollars each year in apparel. By the time they come back into fashion, the siblings are too big to wear them. It is difficult for parents to tell their kids that they can't have something based on characters or stars when everyone else is wearing them and this is just what the manufacturers are counting on.