Season 5, Episode 4: "The Sniffing Accountant"

It's mohair, I think.

Mohair, it figures. I'm allergic to mohair.

You mean, you just started sniffing?

Yeah. Mohair does it to me every time.

I was wearing that sweater in the coffee shop,

when Barry came in.

Jerry, I was wearing it in the bar.

The sweater! The sweater made him sniff!