"Alison" Mask

The "Alison" Mask is a mask first seen in "This is A Dark Ride" It is fashioned to look like Alison DiLaurentis. It is possible that the mask is one of A's many disguises.

Season 3

 * The mask was worn in "This Is A Dark Ride" by an unknown person who is presumably on the A-Team. The person was dressed as Caleb in order to trick Hanna on the Halloween Train.
 * Mona had the mask under her bed while she was at Radley Sanitarium; which made viewers believe that it was her disguise. In the Season 4 Premiere this is confirmed when Mona says she dressed up like Caleb with the Ali mask underneath.
 * In "I'm Your Puppet", the mask is on the body of "John Doe" when Emily and Hanna search the morgue.
 * In "A DAngerous GAme", Mona tells The Liars that Red Coat wore the mask when she visited her in Radley and during "That Night".

Season 4

 * In 'A' is for A-L-I-V-E, The Lady in Black is seen wearing the mask while in A's Lair. One side of the mask is burned.