This plaid shirt is similar to Dean’s Stolen Plaid, but different! It’s got a very simple plaid pattern. The shirt itself looks to be flannel. The plaid is primarily broad blue and white, with a thin red strip running through the middle of the white. It does up with silver snaps. The plaid on the pockets runs on the diagonal.
Brand: Denver Hayes
Dean first wears this shirt in Dog Dean Afternoon (9x05), when Sam makes the spell that allows Dean to talk to animals. He wears it until the end of the episode.
In #THINMAN (9x15), Dean wears this shirt at the beginning of the episode when he and Sam are in the bunker.
In King of the Damned (9x21), Dean wears this shirt until just before Crowley calls and he and Sam leave Cas’ HQ to go kill Abaddon.
In Brother’s Keeper (10x23), Dean is wearing this shirt when he wakes up in the motel room. He then changes into a suit before meeting Rudy.