grunewar wroteI used to refer to the jerseys on the Forum by this term too. But, someone always had a sarcastic comment.
A pinafore (colloquially pinny) is a sleeveless garment worn as an apron.
A penny is a coin (pl. pennies) used in several English-speaking countries. It is often the smallest denomination within a currency system.
Now, everybody on the Forum is ready to win a ton of money the next time they're on Jeopardy. A thank you is not necessary, but would be appreciated, as would be a small percentage of the winnings.