Brass Peanut and Split Pea Lighters, and a pair of medium and large Machined Titanium Flat Gate Clips.
I made a hitched pouch to fit over the smaller Split Pea lighter, using about 10 feet of 0.9mm cord, with the hitching started around an o-ring that is just slightly smaller in diameter than the lighter, but will stretch to fit it on and off as needed. I attached it to the zipper pull of my jacket.
I attached the slightly larger Brass Peanut Lighter to a gadget cable key ring with the medium Ti Flat Gate Clip, which are noticeably lighter than similar sized stainless steel type clips. The stainless steel gates on the Maratac Titanium clips are also the strongest I've encountered on any of the various clips I've tried from different manufacturers over the years.
I added small two bight Turk's head knots, with 0.9mm cord, around the large Ti Gate Clips, and used those on each end of a long 4 bight paracord lanyard.
Here's a link for a similar flashlight 'cap' I did last year, using a rubber band that I had handy at the time...