I was recently in Spain, where soccer is HUGE, and everyone was wearing soccer jerseys all the time. It was like their version of a T-shirt and jeans. I may have bought a few authentic jerseys to bring home with me.
In fact, while I was there, I made a few friends and they insisted on me only wearing jerseys while I was there. I had brought all of these stylish clothes, as I feel I'm a stylish man, but I had to acquiesce. I loved Spain. The people are incredibly kind and friendly and would help this silly American out whenever I needed it. I can't wait to return.