Popsugar Entertainment Halloween Pitch Perfect Halloween Costumes You'll Be the Bella of the Ball With These Pitch Perfect Halloween Costumes October 26, 2017 by Maggie Panos View On One Page Photo 6 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 The Treblemakers What to wear: Go casual with jeans or khakis, a button-up or a t-shirt, and a jacket. How to act: This one is all about the attitude, so you have to act like you're the best boys in the a cappella business. Previous Next Start Slideshow HalloweenHalloween CostumesGroup Halloween CostumesPop Culture Halloween CostumesDIY Halloween CostumesMoviesPitch PerfectEasy CostumesHalloween Costumes For Women