Lets start with a chastity belt.
There was a customer who had been talking to me for many years about the possibility of me building a custom belt to their design. They assured me that they had been working on this design for 5 years now, felt they finally had it perfected and wanted to come to talk to me about it and commission me to built it for them.
They arrived and it rapidly became apparent that they may have been thinking about it but they certainly had no drawings of it and in fact they borrowed paper and a pencil from me to start making preliminary sketches. Not good.
Much discussion and drinking of tea followed, over the hours it became apparent that they didn’t have the money to buy an ordinary belt let alone a special, that they did know at least in very broad general terms what they wanted, that it was totally insane and in any case was totally beyond the laws of physics at least as currently understood.
The belt was to be made of flexible metal (to conform to body shape), strong, comfortable and secure, okay so far then it just gets weird. No welding can be used it must all be riveted as welding is weak, a hundred years of experience would say that was wrong. If hinges were needed they were to have no hinge mechanism but to be riveted in sections of solid “flexible metal” (don’t ask me I have no idea either)
I kept the discussion going perhaps longer than I should just out of curiosity as to what their deluded mind was going to think of next. Eventually I had to throw them out as they seemed to have no intention of leaving and actually seemed to think this was buildable.
In summary the belt was to be as comfortable to wear as silk, made out of riveted uncutable (how was I supposed to shape it even if it existed) flexible (some fantasy space material from NASA labs perhaps) metal. The waistband was to be 2 inches thick as was the guard and it was to be locked with some some huge industrial padlock that they brought with them probably weighing about 5kg. According to my maths the waistband if made of steel would have been about 26kg almost as much for the guard and then the lock, the belt would have probably weighed about 60kg.