I tried that. I have only 1 old uniform and 2 new ones and I can't discart/delete the old one. When I choose the new uniform n°1 as main, for example, the old one becomes the visitor's uniform, then I go to the new uniform n°2 and turn it into visitor's and the new uniform n°1 gets unmarked and the old one becomes the main and the other way around...
It's stuck!!!