If you get tired of playing tug of war with your opponent's lapel while rolling, in BJJ it's legal to work with your own Gi Tail.

In this video, I was originally in Mount and fed my left Gi Tail (bottom of the lapel) under neath Ian's head and into my right hand. The choke winds up tight when you dismount into side control (in this case, to my right) and then rotate into a paralel North South postion and push forward up onto my toes and balancing on my head.

This is one of the tightest Gi chokes I have ever experienced.