Post Malone sported a Dolly Parton-themed outfit during his headlining set at Bonnaroo on June 15—and Dolly “loved” it. The 23-year-old rapper was decked out in a patterned short-sleeved suit adorned with hundreds of photos of Dolly’s face during his 75-minute set. Dolly shared her sentiments on Post Malone’s garb via Twitter, saying: “Love the…