Abstract: A jersey adapted to be worn on a user's upper body comprising a torso portion having a first opening adjacent to the user's waist, a second opening adjacent to the user's neck, a third opening adjacent to the user's left arm, and a fourth opening adjacent to the user's right arm. The jersey also comprises a pocket sling disposed on the torso portion of the jersey and defining in part a hand opening and an arm opening. The pocket sling is adapted to receive and removably retain the user's arm. A method for stabilizing a user's arm and shoulder comprising providing a jersey, wearing the jersey on the user's upper body, and removably retaining the user's arm in the pocket sling.