You absolutely wear them for TX if it is actually happening. This is about more than just cool jersey's. Think of the recruiting exposure from the story of Jack Trice. Not only is Trice's story inspiring, but the support he had from the Ames community at that time (when it was rare most places), and still in modern ISU history when it was the student body that demanded the stadium be named after him. Then the fact that it remains the only stadium in college football named for an African American. It's a story that is not even as well known in Iowa as it should be, putting it on a national stage is a no brainer. You don't waste that on a game which is primarily viewed by in state viewers. You want Texas high schoolers watching that story.
That way instead of the national broadcast showing a cornfield a barn and a silo somewhere miles away from Jack Trice they're broadcasting the statue of Jack Trice, or the name on the side of the stadium, or the mural of Jack Trice in the entrance of our brand new state of the art practice facility. And those kids who play HS football in TX don't end the game thinking that ISU is in the middle of a massive corn field with no sign of any sort of civilization.