Not a good duplicate mind you, but the one Adam Baldwin wore.
Jayne can be seen wearing this style of brown t-shirt with colourful design of a posing lady on the front in the Maidenhead bar scenes when River displays some of her more antisocial qualities. It comes custom framed with a laser cut mount board featuring the film’s title and two movie stills showing the actor wearing the t-shirt. The display measures 83cm x 104cm (32.5″ x 41″)