Seems the real usage of anally anchored clothing is more frequent than one would expect - just found this:
",..some luxurious dresses use in-sewn back-less bodysuits with an anal ball. The exclusive and extravagant dresses with high gaps in the front and a deep cut in the back, make impossible to wear any underwear underneath, excluding also C-string panties or adhesive panties. These bodysuits have a narrow strip of cloth passing through the crotch, ending with a ball, which the wearer inserts into herself. Comfortable, huh?"
(From a
ps-ling.com blog article)
