|left: YSL chunky chain chocker; right: my DIY version|
This plastic chain trim from JoAnns is quite expensive ($20/yard). But if you get only about 10", it's just $5.55 minus 40% or 50% off if you use their coupon. And did you know JoAnns accepts competitors' coupons too?! With only 10" chain trim you can make either a bracelet or a necklace. The trim is available at JoAnns stores in silver, gold and black.
Optional: add a lock charm salvaged from an old purse or from a child's diary (some of them have cute little locks on them).
The chain I used is plastic and its links snap easily together. Sold at JoAnns in their trimming section. Below is a photo from JoAnns flyer demonstrating how to make a belt, but I tried and the ribbon kept slipping out of the link openings. However, without ribbon by just snapping links together turned out quite reliable for a bracelet or necklace.