poncho

But who will protect your eyes?

Buddy, that poncho is see-through...

Who let the The Man With No Name into their bar? And then they gave him beer. He's only going to cause trouble. Didn't you see any of the movies?

When the going gets tough, the tough forego umbrellas in favor of garbage bags.

Maybe they thought the ponchos would help the team "rally". People can get awfully clannish about their home teams.