I would think if you shot a Glock with the kind of grip shown with the revolver the case might stovepipe or not clear the chamber. If the slide closed on the shirt it could get tangled and more difficult to draw cleanly for the second shot.
I would think that have a forced malfunction and a predictable non snag would be better than a 50/50 chance of some unpredictable malfunction and draw.
Of course this is all mall ninja stuff, but you can only talk about Mozambiques so many times.