Giambi's panties.

A gold lamé thong with a flame-line waistband.

"I had it over my shorts and stuff," [Derek Jeter] said. "I was 0-for-32 and I hit a homer on the first pitch. That's the only time I've ever worn it."

Johnny Damon also admitted donning the golden panties "probably three times."...

What is the secret of Giambi's golden thong?

"You're not worrying about your hands or your balance at the plate," Damon said. "You're worried about the uncomfortable feeling you're receiving."

Uncomfortable... because it's a thong or because you know it's gold lamé thong with a "flame-line" (whatever that is)?

Catcher Jorge Posada [said] that "a lot of players have worn it," but he didn't name names. Asked if the thong got washed between wearings, he gave a cringe-worthy answer. "Ask Jason," said Posada. "Jason is a little strange."

If the point is to make you uncomfortable, you shouldn't wash it.

ADDED: I fixed what was a misattribution of the first quote to Jason Giambi. Sorry.