I sometimes buy items simply because I like the graphic design. I’ve been known to wear T-shirts from teams or places I have no relationship to. Here are some examples:
It tends to cause the occasional awkward question, like “Did you play Lacrosse at Middlebury, Vermont High School?” (No, not even in New York State where I grew up…) “No, I just liked the design so I bought it as a souvenir on a trip up there.” That causes a confused look and the person usually moves on. But I love design and show my appreciation of it this way, even if it might be hard to explain to passers-by!