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 11 of 27 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 11 Toby Cavanaugh (as a Police Officer) What to wear: A police officer costume would definitely do the trick. How to act: Young, ambitious, and ready to do good. And flirt with your girlfriend. Previous Next Start Slideshow Pretty Little LiarsHalloweenHalloween CostumesPop Culture Halloween CostumesTV