There's been a lot of ways to tell Rich Rodriguez is simply more comfortable at Arizona than he ever was at Michigan: the smiles, the wins over USC, the seventh-ranked FBS offense, the sombreros. 

But via Richard Retyi, here's the most compelling evidence yet:  

Yes, that's a display from what appears to be a University of Arizona bookstore that proudly proclaims that the "RichRod APPROVED" Tommy Bahama shirt in question is "the only college specific Tommy Bahama shirt in the United States!"

Now, try to imagine Nick Saban or Will Muschamp in a Tommy Bahama shirt (404 Error Mental File Not Found, right?) and you'll have the cultural difference between the SEC and the Pac-12 in a nutshell, right?