I hold the car in my left hand, hook in the right zipper track with the right, start the car up the zipper about 2 inches with my left, and switch to my right to pull up. I had to go put my jacket on and observe because it's instinctive. I never realized that I switch hands to pull the zipper up. I'm right handed, and putting on a girl's jacket or sweater, I fumble and take a while, probably switching hands a few times. In all honesty, though, my lifejackets have plastic clasps that fit much better than a zipper jacket, anyway.