Ernie Banks, Not Mike Fontenot!

My nephew Matt snapped the photo below at a signing appearance by Mike Fontenot. What's wrong here? Well, for one thing, Fontenot wears #17. He also wore #29 during his first stint with the Cubs in 2005.
Why would someone get a Fontenot jersey with a wrong number? I know, people make mistakes. Still, when going thorough the trouble of getting a personalized jersey (even one like this tshirt jersey), you should be thorough enough to get it right!
I am not sure if Fontenot saw the jersey at the signing. I wonder what his reaction would have been? I know what Matt and my reactions were...laughter.
Oh, by the way, #14 is retired. It was worn by a pretty good player named Ernie Banks!