How many kinds of high school uniforms are there in Japan? What's the difference between high school uniforms and junior high school uniforms?

There are roughly two kinds. One is a suit style and the other is a stand-up collar style. The suit style is that all boys wear suits and ties. The stand collar is a black stand collar. Girls have navy-style generous collars, and the other is to wear suits and ties like boys.

Generally, private high schools must wear school uniforms, while public schools do not have strict dress requirements, and some schools can even dress freely.