Don't know if I'm qualified for this topic.Logically thinking..
'Gyaru' style(s) is a trend that originated in japan. Although some of attributes of the gyaru style (current) is more natural, you could say. It's something you would see in every-day make aorund the world, only Gyaru is more exerated.
And like all trends they travel around the world. Some continets pick it up, some pick ip up over time, and on other continets it just doesn't pick up.
Regardless of why Japanese gyaru do it, it's considerd a trend now a days, logically speaking
.\\Sorry if I offend anyone.\ I know to many gyaru it is considered a life style--which it is. So were a lot of other trends--all trends have a life style attatched to them.
My point is.. anyone can be gyaru. But if they want the title of GYARU they have to follow the original treands to a point. Make it your own, yeah. But don't stray too far or most may not consider it 'Gyaru'.
That's all I have to say about that!