But now I usualy wear it just a little lower than Steve Vai , and I think it looks pretty cool on me.
I worried more about looking cool with the guitar as I was a beginner , but now all I care is comfortable playing ... Wearing the guitar very high is more comfortable for the fretting while wearing it lower is more comfortable for my picking.
BTW, Your performance is what makes you look cool , not how high/low you wear the guitar.