I used to belong to the Small Boats forum on Yahoo, but was kicked out for having an opinion contrary to his self (Don Elliot runs the group with a tight fist). Ayway, he has a drawing of a DIY harness that is two ropes - one around the waist and oneover the shoulders like a long necklace. Both ropes have loops on both ends and all loops meet at the naval where they are clipped together then that clip is clipped with a quick release to a line on the boat. You would really need to know how to braid properly to make the loops, Knots could work but would be bulky with 4 loops.
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.