On the one hand, I wouldn't want to play Wichita St. now. On the other, you saw the note. They probably had a bunch of illustrations made with combinations of teams that were likely to make the Final Four. Can't blame them for leaving out a #9 seed. Would be worse if it was the real shirt.
Having said that, it's kind of like what happened to Mississippi St. in 1996. I can't remember if it was the hats or the shirts from their regional championship that said Mississippi (as in the Rebels). Another coincidence.