We already have this, but they go on the backpack slot. They're electropacks.
Perhaps, though... a collar would be decent. Though maybe for sentences over ten minutes.
Why?
A criminal starts breaking the window, the collar auto activates and shocks the prisoner. Prisoner starts hurting themself? Same thing. The collar could deactivate when the sentence is up, and drop to the floor. If someone without a security ID tries to pick it up, it makes a loud beeping sound until placed down.
Because, seriously, the greytide that constantly breaks down the window (Or themselves) is irritating to deal with, and even worse when you have 3+ prisoners doing the same thing.
For permabrig, however, this wouldn't be necessary. It would feel more like overkill, honestly.