It was rope, but when he took off the thin dress from her body, the dress was then wrap around the rope because it can't get off since the rope tied both of her hand.
In one of the Madoka magical movies there is a girl that uses her power to turn back time again and again to stop the one cat thingies from making a deal with one of her friends
Is it a large cloth or rope that has bound her hands
It was rope, but when he took off the thin dress from her body, the dress was then wrap around the rope because it can't get off since the rope tied both of her hand.