One today is our willingness to walk around wearing clothes which sports advertising for the manufacturer. Ever since Calvin Klein discovered that he could double the price of underwear by printing his name on the outside of the waistband, more and more companies seem to be moving the same way. I have a T-shirt emblazoned with the Coke polar bear, half of my dress shirts and pants have little labels on the outside. But it doesn't stop there. I have a shirts that celebrate a sports team, a university I attended, and several for places I've visited.
Some people wear shirts which declare the groups they belong to and the causes they support.
Really, it is more than advertising. It's about declaring our identity. But I don't think we are willing to hang all of our identity out there in public. Recently I was in a big Lutheran bookstore in Kitchener. They had tasteful sweatshirts with Biblical passages and Christian slogans on them.