How to anti-slip the RX100?

I would so love to use my wife's RX100, but my dry hands cannot hold that tiny, slippery body safely enough.

An added grip is not in the cards as she wants to keep her Sony jacket case, which doesn't have room for that grip.

I was thinking along the lines of attaching some film/foil around the right front, a film that will add some stickiness, and stays that way (on, and sticky).

Who knows of such a film? Or what else can I do?