Yeh I guess thats true, I had some trouble getting the levels that I wanted without blending the frame in or out too much. I tried a few with the frame (cardboard cut out!) reversed which was white on the other side, but then it stuck out on the tshirt and not on the background!
i'm so stealing this idea for my next wedding..that would be a cool formal shot...a "framed" shot of a groom giving the bride a soft peck on the cheak (or something like that).