hey
i have been riding 4 a year now and weigh 60kg, my parents as well insist that i should get a PFD/impact vest and now i use an o'neill reactor impact vest which provides heaps of flotation(i am wearing it as i am typing now). They also warm u up, and gives you that piece of mind when u crash ur kite 2km offshore. they dnt get in the way and they dnt look to gay(i hope),
in regards to body dragging the vest sits very close to your body so body dragging upwind is still easy.

i recon get one