This shirt is very odd. It’s the colour green that Dean favours. It has two breast pockets and does up with dark buttons. It also has very pronounced stitching along its seams and a very odd double seam above the breast pockets (double pockets?).
Brand: *Possibly* Old Navy
In Bad Boys (9x07), Dean wears this shirt from when he and Sam go to the diner until the end of the episode.