Party has no idea whose shirt it is. It looks like it could be either of theirs and besides his one leather jacket, he really doesn't keep great track of his clothes. Half the time he can't tell if Ghoul's wearing his stuff or not unless it smells like both of them and even then, it's possible it was Ghoul's to begin with.

"If it's in my apartment long enough, it's mine." He grins and blows Ghoul a kiss. "Guess that means I own you, too."