I'm very certain those are Photoshopped. Especially the second one - if you look at her ass [yes sorry] and the legs that are leading off, you can see that they are closed, whereas her actual legs are not together like that.
it's painted on the skirt to make it look see through. it's a real product though. idk I would want one that made my but look better than the ones in the pictures though. With pretty undies too!