Where is this being discussed on Reddit?
My first thought: make it a bodysuit with full sleeves and pants. Include some strips of smart fabric going from the ankles, up the back of the legs, around the chest and down the interior of the arms to around the wrists. In an emergency the suit could constrict, binding the arms and legs behind the back and kinda hogtieing the person for handling.
But then I'm like, "Some prisoner is totally going to cut their suit up and turn it into a machinegun" I don't think there is any clothing that would be safe to give a prisoner, and it might be better to just leave them naked the whole time? Maybe just project a uniform over them.
I'm also thinking you'd want something to help contain the more powerful bodies in the setting. I would think you would want to build a prisoner-handling Mindy armor: One that would wrap itself around a prisoner and limit their ability to interact with the outside world as well as give complete monitoring over the prisoner.
You might also want to go with an ankle bracelet that contains some movement-restricting foam. In an emergency the canister on the ankle bracelet would release its payload. It might not completely envelop a person but it'd add a huge mass of quick-hardening foam to their lower body making it very difficult to move.