I wonder how hard it would be to make a belly chain / belt out of handcuffs (4-6-8 pairs?) of them that would be an accessory and it would just be the handcuffs no fabric
well, you can add several handcuffs and pose around the hip. Parent to the 'pelvis' bone in the figure and with some effort you got it.
There are many handcuffs kits in the forum