I did the same except it was my white undershirt. Had my jersey on with a different shirt underneath. Switched back to the normal white undershirt at the half. Voila.
I have a yellow LSU bb cap which I bought in 2002 and was autographed by 3 NYC firemen that was at the world trade center on 9 11 01, I never wear it except when the tigers play but don't put it on till the tigers need a little help. I put it on when we were down 10-0 and a few plays later the Honey Badger took the punt to the house!