I imagine an elegant high-end steel-gray version of this footwear: the jailbird model.
Suddenly I'm reminded of a trivial but true anecdote, many years ago, in the family flat of our concierge (guardian) in the rue Rambuteau. One of the youths was trying to lower a heavy bed from a first-floor window to the pavement in the courtyard, several meters below the window. To support the weight of the bed, he had coiled the ropes around his shoulders and neck. All of a sudden, he lost his grip on the ropes, and the big bed jolted downwards until it was suspended in the air about two meters above the surface of the courtyard. Meanwhile, the ropes had tightened around the fellow's neck, and he was choking for breath. We terrified onlookers lost precious seconds while we climbed onto chairs and boxes to take the weight of the bed, enabling the silly bugger to unwind the noose that was strangling him and get loose. In fact, he had a few screws loose, as they say. Fascinated by firemen, he always got around in the rue Rambuteau wearing bits and pieces of a fireman's uniform... in spite of the fact that no self-respecting unit of firemen would ever accept such fellow in their ranks.