803Pcs Grommet Eyelet Pliers Kit, 1/4 Inch Grommet Tool Kit with 800 Metal Eyelets, Grommet Hand Press kit for Leather Crafts(Inside Dia: 6.4mm/Outer Dia: 12mm (A.I.S.)/Flange Width: ~3mm)

Find some leather straps you want to use first. If you really want to be DIY, you can up cycle them from purses or belts that already exist. Note: I i’m just posting links to demonstrate what I’m talking about, I’m not an affiliate, and I’m not even sure if the exact ones I’m linking to are any good, do your own research. Before you cut any straps, make a mock up to make sure they’re the right length. Make sure you include extra for folding over the rings and attaching. Find or make a belt you would like to use first. The belt running around the waist is decorated with grommets. The larger rings with the side chains are called D rings. You can add grommets to your belt. There are various tools at hammers and pliers. You will have to cut a hole first. https://a.co/d/foxrcH6 Trivia: the difference between a grommet and an eyelet, the Grommet has a backing. For use like this, I would definitely recommend it over an eyelet so will not pull out. This looks like the straps are fastened with rivets. https://a.co/d/9Mu8nqK The side straps are decorated with screw in spikes. You can get them in all sizes and shapes. https://a.co/d/iaWrTvN For the actual chains, I recommend going to your local dollar store and buying some cheap dog leashes. You can also get fashion chains on Amazon as well. Look for purse and handbag accessories if you can’t find them in the fashion section. You can either use carabiners or clips to attach the straps to the belt. I hope this helps some, let me know if you have any questions