The vision I had is that jaberwock is referring to slipping out the bottom, through one of the legs?? Since squarecuts may not have a snug leg opening like on a racer cut?
Tropical-Squarecuts-3 by
C J, on Flickr
I know I do not have a potential problem of slipping out anywhere. There's not enough there to slip.
But I have heard that the waterslides do a number on your backside, and either in squarecuts or racer cut suits, you will end up with quite a wedgie.