In tokyo and kanto region, it gets warmer. And a little snow is left until early or mid april in those areas. Below are some pictures to give you an idea of what to wear during your stay in japan in the spring.
Spring fashion show
Spring outfits skirt
Spring outfit color combinations
What to Pack for Tokyo, Japan in Spring livelovesara in 2020 Travel
March is looked on as spring in japan while it has snow in hokkaido and northern japan.
