These jerseys are unlockable via the Campus Store under the Extras menu. 
All items are unlockable using points you earn during game play.

Effect                                               Code
---------------------------------------------------------
Arizona Wildcats Alternate Jersey (red)            - 45 Points
Duke Blue Devils Alternate Jersey (black)          - 45 points
Florida Gators Alternate Jersey (black)            - 45 points
Illinois Fighting Illini Alternate Jersey (orange) - 45 points
Michigan Wolverines Alternate Jersey (yellow)      - 45 points
Missouri Tigers Alternate Jersey (yellow gold)     - 45 points
Notre Dame Fighting Irish Alternate Jersey (gold)  - 45 points
Oregon Ducks Alternate Jersey (bright yellow)      - 45 points
Pittsburgh Panthers Alternate Jersey (navy blue)   - 45 points