Popsugar Entertainment Pretty Little Liars Pretty Little Liars Halloween Costume Ideas Have a Pretty Little Liars Halloween With These Costume Ideas October 17, 2017 by Ryan Roschke View On One Page Photo 19 of 27 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 19 Caleb Rivers What to wear: Caleb has a very punky, edgy style. Wear dark clothes, and give your hair an alternative-looking style. How to act: Caleb's kind of a rebel, so don't be afraid to let out your inner bad boy. Previous Next Start Slideshow Pretty Little LiarsHalloweenHalloween CostumesPop Culture Halloween CostumesTV