Maize Jerseys (Historical Conundrum)

Let me begin by saying that I am anti-Maize jersey, and this is not a call for anything to be added or changed in the current football uniform options. However... As an avid reader of UniWatch, I saw this link in the ticker this morning, which took me to this PDF of Michigan's uniform history. It's pretty neat stuff, and then you get to page 20. It shows that in 1964, Michigan wore Maize jerseys. I have never, ever, heard anything about this or seen any visual evidence of a maize jersey in any previous discussion. Can I hopefully just presume that this is a mistake on the part of the artists and that should just be a simple white version of the road jersey? Thank you for your time and feedback.