Buy some three-strand
I saw this done on a cute little ODay & had to do it for my boat. I bought some smaller diameter 3 strand line. Can't recall the exact diameter but it was the largest that could fit through the loops on the stanchions. I bought a couple of bronze pelican hooks and spliced the line onto them. I attached them via the pelican hooks & then stretched them through the loops to the forward loop on the bow. I pulled with all my might, marked the line, unhooked the aft end, spliced them & voila! Very nautical, attractive lifelines for pennies. Some may voice concern that they wouldn't be as sturdy as wire lines. True true. BUT...I sail on the Columbia River & NEVER attach myself to my lifelines. I'm never out in nasty weather and besides, if it was nasty, I would prefer to set up some jacklines.Anyway, if they become a little stretched out & loose, all you have to do is unhook them for a few days & they'll shrink right back up again. I've had mine for over 3 years & they still look great but if they wear out or get ugly, it's just pennies to replace. LaDonna