Where should I buy the replacement?

I asked Jim to send me a pic of JT last night, as I was missing him horridly. This is grainy as it's from his cell phone - but you can see the bib-less JT covered in squash and cereal. According to Jim "we don't need no stinkin bibs."

Issue is, this is a borrowed shirt, so the question is . . . Karen, where do I buy you a replacement?