Milo Ventimiglia on E! Online 

just realised that this is after his hair was cut and thats why he's wearing a wig, i thought that he had to film 4 months ago before he cut his hair

that explains the chared top, it would be during filming what happened to peter after and during the bomb, cos when i watched this a month ago i was like have i missed a scene as i hant seen peter looking like that, great this clears it up after watching the trailer for 4 months ago. wooo!!!