Yesterday I bought a new pair of Dickie's work pants and one of the hang tags was plain white, nothing on it. I held it up to the light and sure enough, the RFID antenna was plain as day.
Where did you buy them?
I would be tempted to leave the tag in the restroom of a topless joint, along with penning the phone number of the CEO of the company, saying, "For a good time call XXX".