Oh, not necessarily uniformity - just a better mixture than ONE little guitarist sticking out like a sore thumb.
I mean, most bands have some sort of outfit agreement when they perform, so maybe Miyavi's input will move them a little more into the visually interesting realm whilst the other two may calm his over-exuberant style into something a bit more bearable for the human eye. (On the pictures from Myuu - which are EXCELLENT by the way, thank you very much! - one can hardly decide WHAT aspect of his outfit to look at, it's all so wacky you can't comprehend it in a single glance. XD)
So that's what I meant by that.