you can easily buy plastic chain links online and at your local hardware store. tho u could find shackles at your costume store and mod them. if they are too hard to mod i would build them over a silver clasp bracelet that you could cover w sintra or another cover to give a smooth texture. itll be easier to get on and off instead of having to fit it over your wrist and not have it exactly as form fitting as hers. hope this helps!
Adelheid (KHR!)- 85% done
Fem!Austrian War Succesion France (Hetalia/Nyotalia)- 10% done
Fem!Izaya (Drrr!)- 90% done
Magent!Teto (Vocaloid)- 95% done