Hime gyaru is a sub-section of the ever so lovely Japanese sub-culture Gal or gyaru (ギャル). Telling a hime gyaru apart from the other gyaru is very easy, they are known for their big volumeous hair, princess like make and clothing.
Some famous himegyaru brand that you should know if you want to look further into this fashion is Jesus Diamante and Liz Lisa. These brands are quite expensive, most people says that in order to afford these expensive clothing these girl usually work as a hostess