Jayne's Arm-Girl shirt makes an appearance in Out of Gas in a flashback. The same graphic appears in the movie as well.
More after the break...
Here's one more cap from Out of Gas:
Here's the costume from Serenity, when Jayne is helping Mal take the cannon off the top of Serenity during their rebuild.
This particular costume was up for auction at Propstore.
My Photobucket Album for Jayne.
Serenifly Costumes site for Jayne.