Did no one else find this hilarious?
Ah, Kevin R, you make the Johnny Bravo LOL.
FWIW, if it were me, I'd roll back into the store, say, "I think I paid for a shirt but left it here" and when the girl produced the shirt I'd say, "Yup, that's it, but I'm still a little up in the air on whether or not I like it; see you in a few days" and then walk out, again leaving the shirt on the counter.