The singlets feature Penn State's original pink and black color combination.
Penn State fell 82-81 and to a 5-6 season record, but the support for the blue and white in the World's Most Famous Arena was strong.
Meyer has two seasons of eligibility remaining.
Penn State's 76 points marked its largest margin of victory in team history.
Allen was most recently the head coach at Indiana, a position he was fired from in November.
"I'm coming back, and why does that need to be announced? That should be the expectation."