BigPhysicsBastard - It's good to hear that I am not the only Engineer on this board. I am in Telecommunications and you?
It seems as if bench shirts have gone way, way beyond their original purpose. Now you need nearly half the max weight on the bar just to push the it down to the chest! If it is TRULY a safety concern than it is 'UNSAFE' to wear a bench shirt if it allows one to go 10 - 35 percent beyond their max (rough estimates of safety limits)! A bench shirt that is designed for safety should not allow one to bench more than a few percent beyond their 'raw max', correct?!?!? I mean apply logic consistently people! As far as the shirt returning to its original weave/structure, BigPhysicsBastard is correct. It is just like a spring!
A chain is only as strong as its weakest link. If one can't work on the weakest link and make it stronger, than it will be the limiting factor in one's max bench. The bench shirt instantly strengthens the weakest link. That is not a true test of 'raw strength'. Go work on the weakest link in the gym, without a bench shirt and bring it up to strength; focus on that and get rid of the bench shirts once and for all!
Now here is the problem - what Bill Crawford has done in the past really doesn't matter today. I read a recent interview of him in PowerliftingUSA and he seems like a good guy.
I think it would be a good show in the sport if all benchers rotated contests whereby they would compete once in a while (notice I said 'once in a while') WITHOUT bench shirts. It would be a good grass roots motion on their part to return to where benching was (and should be by some opinions) 15 years ago. I understand strongestsurvive's point. He feels that the equipment is skewing the results of who is really the strongest. He may only get 10 percent out of his shirt where Bill Crawford gets 25 - 30 percent. Don't knock the guy. He is only venting. He seems like a really, really strong guy' he is just tired of all the equipment. Maybe they should implement a new rule. If you cannot put on your bench shirt without assistance, than you cannot wear one!