Not everyone has a gold shirt lying around. Sure I could get one, but we also don’t have any for our kids. Now I’m looking at $80-$100 worth of attire to get ready for the game. I’m not really complaining just wanted to bring up a reason why it doesn’t just happen.
IF you would like to participate in the color plan and do it for less $ than you mentioned, you could find gold shirts at a thrift store. Probably even find some officially licensed Iowa State gold shirts at one of the thrift stores in Ames when you arrive in town. Just an idea. Take it or leave it.