Squat suit technology kept improving, so equipped records kept getting broken, and meanwhile the best guys were competing in gear vs raw. Now, there are some top guys competing in raw, so they're breaking all the raw squat records that no one was going after before.
Deadlift suits don't seem to improve as rapidly, and some folks even pull better without them.
As for bench, my guess is that we had a few freaks show up (Spoto, Mendleson, Kenelly, etc) that set the bar really effin high. Some of them were even able to go raw and equipped.