Well you may want to try poking around on these sites for info:
Know what's now in Tokyo! style-arena.jp
Check out the "New Tribe" section on the above link.
FASHION JAPAN
Keep in mind that some of the major fashion trends (like gyaru and Lolita) all have very specific sub-categories with their own rules for being called X,Y or Z. Once you find a style label, best to then Google search it for further descriptions and breakdowns.