Johnsy was trying to send us a pic of the alternate jersey but work and tech hassles won't let him.
As Drake said, there's a pic of Barrett on the Adidas site. He's wearing a training shirt, all white with the Adidas stripes down the side.
Johnsy describes a similar altenate jersey only reversed: all red with white stripes down the sleeves.
To use your imagination: add the sponsor and badges.
Sorry for the crappy attempt at the graphics but basically its a steeler's jersey with the white adidas stripes down the arms, the St George bank logo will naturally be across the rib cage area.