I tried to get a lora for swedish collar like metal collar, so it obviously worked quite well :)

the activation word sw_metal_collar is not needed

just describe what you want to see like "She is wearing a large, metallic, silver collar with a ring at the center"

V2 is live, retrained the whole thing with some more images featuring the coresponding cuffs :) so now you can prompt for metal handcuffs and they match the collar :D just see the promos for examples in prompting