Shibuya109(Shibuya):
Gyaru-fashion
really fashionable clothing at an affordable price
it's pretty noisy and lively there (but I love it)
Laforêt(Harajuku):
many foreign brands, in general more casual than the Shibuya109. On the bottom floor are also gothic/lolita shops. Some brands are quite expensive
O1O1(Shinjuku, Ikebukuro, Shibuya,...):
I think one of the Shinjuku 0101s sells gothic/lolita stuff, but the others are pretty "neet" and casual, quite expensive