The shirt is most likely from the band, Panic! At the Disco. The name of this band is commonly shortened to P!ATD, seeing as there is a exclamation mark and not a question mark. But, Tara is known to make mistakes often so this doesn't mean anything in particular.

Additional InfoEdit

This appears on "Diabolo with his red hair" even though it had been stated that Diabolo now has blue and black hair.