Have a look:
But of course the “fact checkers” had to come to the rescue:

How on earth did PolitiFact “confirm” it was a crease in his shirt? Did they inspect his shirt immediately after the debate? Of course not. They probably asked a Biden spokesperson if he was wearing a wire, they said no, and that was good enough for the “fact checkers.”
What an utterly ridiculous claim to make.
And on top of this Biden refused an “ear inspection” before the debate:

Why on earth would they not agree to this? If you’re not wearing an earpiece, then what’s the harm in allowing an “ear inspection”?