The coolest acts to catch at Bonnaroo? Kanye West, Vampire Weekend, Janelle Monáe and, most importantly, your outfit. Especially when it involves a spectacular kimono. Layer this summer hero piece over a tie-dye tee for a psychedelic print clash by day, and then secure it with a scrunchie (yep, they’re baaack) to create a pretty-and-polished look for night. Oh, and don’t forget to pile on the bijoux. Watch the vid to find out how…