OK, I give in and Peter Hurley was not making it up if suits with the lattice sides really existed (though he's probably dead by now and I cannot ask him and I would have preferred to see some proper Jantzen photos to confirm that design was in production at the time).
As I live and learn I also picked up this:
I still cannot find the swimsuit with lace-ups on BOTH sides but it seems there was one (blue here) from the 1940s which so performed on just ONE
side.
Never seen that before but it apparently comes from Allen-A Lifeguard (yes,
that is what it says) and has just been sold (22nd April) by Etsy (which seems to be a sort of Ebay from Leesburg VA).
See if this works:
http://img3.etsystatic.com/il_fullxfull.314628295.jpg
PS: I thought KW died about a year ago - it was in fact 2002