Let over crowding work out its own solution.
Fence in a piece of land two miles on each side. Triple fence with motion sensors, center one electrified, cameras and only one gate. all those sentenced to life without parole get to go in but do not come out. When they go in they are handed a back pack with garden seeds and a few hand tools and told to plant quick if they want to eat. No guards inside the fence. The inmates must police themselves.
We would need several tiers of prisons for that. One with the rehabilitative ones and stagger it up to the completely violent and hopeless cases. The ones who have absolutely no respect for anything.
The ones that are small time, one time crooks could clean up the mess from the others so they could see their futures if they didn’t shape up.
Still liking the yellow jumpsuit idea. Make’em think about their impending demise.