This is a 3 piece set which consists of a black T-shirt, a navy blue turtlenext sweater and black pants by Royal Robbins.
The tee and the pants were used by Lauren Cohan in scenes 118-178, however although the sweater came in the same set it was marked seperately as 'Stunt' and still has the brand tags connected to it, therefore I believe the sweater was never used and was just a back-up to the main sweater.