I don't know about this Rhett guy's kid, but I can tell you about my own daughter's t-shirt she wore to her first V-Fest last year.
Her mommy bought a black t-shirt and some kind of iron on kit and made a Meat is Murder t-shirt. Originally worn as a protest at a friend's meat-centric party, but worn for a second time at V-Fest. It received many compliments from teenagers drunk on Red Bull. Probably cost more than those available online, but at least we can rest assured we're not lining Mr. Morrissey's Armani jacket.
The only question I have is does anybody have a Dr. Dog ticket they can sell to me at face+whatever fees you paid? If so, please PM me.