Leonard wears a Nebraska football jersey that looks more like a football cocktail dress over to Penny's to watch the game.

The Big Bang Theory Season 3 Episode 6 Quotes

Wolowitz: I would have caught up to her if I didn't pull my hammy
Raj: Oh please, you weigh 80 pounds, you don't have a hammy

Leonard just realized that Penny's been hiding him from her friends because he's a tiny little man who flies kites