OK, to help clarify some things...
I called the venue of the meet and talked with several of the powerlifters there, which assured me that 4-ply was fine for the squat suits, and that open back denims are fine too.
As far as the Missouri Chairman, it took some hunting down, but I found him. I talked to his wife, very nice, and he will call me back tonight about the records. (So please no one call them in the mean time.)
His name is William Wessels and the number is 314-770-9279.
To make sure of the APF rules, I bought a book ($5), from Frantz, and should have it in a few days to make sure we are all good to go.
AnimalMass