After seeing what we saw with Garrett (Yani Gellman) and the "baby monster" costume/mask during Pretty Little Liars' season 3 Halloween episode, "This is a Dark Ride", a fan asked PLL writer, Andy Reaser on Twitter if Garrett might have been the only one wearing the costume from the start.
@swankydtr it is not safe to assume ANYTHING in Rosewood.
— Andy Reaser (@AndyReaser) October 30, 2012
You'll remember, we also saw the same costume multiple times during the first PLL Halloween episode, "The First Secret". That couldn't have been the same person (nor did we ever really suspect it to be). We also saw the costume in episode 5 of Pretty Dirty Secrets, "TrAde Off", in a scene with Lucas (Brendan Robinson).
But Andy's response now begs this question, was there more than one person donning the "baby monster" costume even during "This is a Dark Ride", or was it only Garrett?
Source: Andy Reaser via Twitter