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 4 of 27 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Jenna Marshall What to wear: Dark clothes and big, black sunglasses. How to act: Make sure you have a walking stick and perhaps someone to lead you around. Jenna always has that sly smile, too, like she knows something you don't. Previous Next Start Slideshow Pretty Little LiarsHalloweenHalloween CostumesPop Culture Halloween CostumesTV