Right arm (lefty) staying connected to the body

I've been having some trouble with my right arm (lefty) floating away from my body on the downswing.  I believe this is causing my club head to dip way inside and leaving my face open.  With a face open to the club path results in an occasional nasty push slice.  Anybody else have any experience with this?  I've read a little bit about keeping the armpit pressure points by using a glove or a tee.  Is there anything else people have had success with?  As you guys could imagine, these misses, especially with the driver are horrifying!  Thanks in advance for any input.

Rfordeagle, I've recently been working on the same thing from the other side (righty) of the ball.  I've been concentrating on keeping my left arm straight, close to my chest while making a good turn with my shoulders away from the ball.  I have trouble with the drill of keeping a glove or towel under my arm...it just doesn't feel comfortable, and I'm sure it's not suppose to, but I just haven't been able to make it work.  I saw a person on the range the other day with a bungee cord around the outside of their left arm, and around their back and chest and under their right arm attempting to keep the left arm close to their chest, or keeping the arm connected during the swing.  I haven't tried this drill yet, but thought I would pass it along.