This was, well, interesting and insane:
"The "raw" in the record comes from the fact that Spoto doesn't wear a bench shirt or any other kind of supportive clothing; he's there in a singlet and leather belt, plus gloves. Bench shirts are insanely taut, made of denim or polyester, and both cushion the lifter as the weight depresses and help the lifter get the weight back in the air. As a result, the current shirted world record stands at 1076.9 pounds, more than half again as much as the raw record."
Wow.