This plaid shirt is predominately a nice lavender colour. It looks flannel and has one breast pocket. It does up with buttons. Some fans call it the Bisexual Plaid, because it’s the colours of the Bi Pride flag! Yay Bi Pride!
In The Things We Left Behind (10x09), Dean wears this shirt from when he and Sam meet up with Cas until the end of the episode.
In The Executioner’s Song (10x14), Dean wears this shirt when he and Sam are at the food truck and Cas calls about finding Cain’s graveyard.
In The Prisoner (10x22), Dean wears this shirt when he calls Rudy and begins to track down the Stynes after Charlie’s funeral.
In Love Hurts (11x13), Dean wears this shirt at the end of the episode, as he and Sam pack up the motel room and he admits to his unwanted feelings towards Amara.
In The British Invasion (12x17), Dean wears this from when he successfully kidnaps Kelly Kline until they get back to the Bunker after the showdown with Dagon.
In The Scorpion and the Frog (13x08), Dean wears this shirt at the beginning of the episode when he is cleaning his gun in the Bunker – and keeps it on until they decide to work with Bart after checking out the veracity of the spell he’s offering them.
In The Thing (13x17), Dean lends this shirt to the young woman they find chained up In the Men of Letter’s Chapter House in Portsmouth. She wears it until she tries to sacrifice Dean to her interdimensional monster lover – at which point we see she has taken it off in order to perform the ceremony:
Jensen wore this shirt to the LA Supernatural Convention in Pasadena in 2015