Haven't seen crotchless yet either but did see transparent crotch. Was almost like a window in the right spot. lol
My wife wears size 27 jeans and wears medium bottoms from WW. Also if there is any concern, I think they offer side ties as an option on most of their bottoms. Hope that helps!
Sheer and Fishnet My wife wears white sheer (so sheer they may as not exist) as well as fishnet with holes the size of my little finger and they have never asked her to change. I also have not seen crotchless, but I would love to see someone try them :icon_surprised: