Tim McDonald and Myke Horton will make very deliberate wardrobe choices Saturday. McDonald is a former All-American safety at USC and the father of USC safety T.J. McDonald and UCLA safety Tevin McDonald. Horton, a former offensive lineman at UCLA, is the father of USC defensive end Wes Horton. Both proud fathers will attend Saturday’s USC-UCLA game, but they won’t dress alike. “He’s not wearing any blue,’’ T.J. McDonald said of his dad. “He won’t wear cardinal,’’ Wes Horton said of his dad.