[T37Chef]

Harness first, PFD if needed in addition. The tether should be able to come through the PFD just above the waist where the ring is. More important IMO would be that the tether is short enough that they cannot get out of the cockpit. No need form them to go forward in bad weather anyway. If they do use the jack lines its probably (should be) in relatively benign conditions anyway. Our two girls prefer the harness over the PFD for obvious reasons, especially on a hot summer day

 

[T37Chef]

You can't tell well in this photo but the tether is fairly short, attached just below in the cockpit to a pad eye. She can attach the tether from the companionway to the pad-eye, to the jack lines if allowed, and so on. They feel very secure when wearing them, as do I

Yes, Olivia is tired in this photo, I think we were off the Jersey coast in this picture headed South for Atlantic City.