Sam’s got a new coat for S11. This one is blue with two breast pockets that have flaps. It may do up with both a zipper and buttons, though it’s hard to tell. It definitely has large buttons.
In Baby (11x04), Sam wears this coat when they leave for Oregon. He keeps it on for almost the entire episode, except for right when they’re leaving the Roadhouse in the morning, when he’s in a suit, and any time he is in the backseat. ;)
In O Brother Where Art Thou (11x09), Sam wears this coat when they meet up with Crowley, when they go to Crowley’s throne room to recruit Rowena, and then again when he goes to Hell to speak with Lucifer.
In The Devil in the Details (11x10), Sam continues to wear this coat for the entire episode
In American Nightmare (12x04), Sam begins wearing this when he re-enters the farm to try to track down what he thinks is Magda’s ghost. He wears it for the rest of the episode.
In Good Intentions (13x14), Sam is wearing this jacket when he and Dean get back from dropping Donatello off at the hospital, and they talk with Cas about the consequences of his actions.