The designer's background is in ballet, right?
Only these just look like dance belts but a bit less...thongy?
en.m.wikipedia.org/wiki/Dance_belt
Also, an unfortunately angled background crease in the gauzy gold material swathed round Liu in one photo, makes it appear at first glance as if Liu is having a wee...
Anyway, I really don't think that underwear designed to encourage the idea in confused young boys that their penis ought to be hidden/tucked away/something to be embarrassed about, is a healthy notion.
If adults want to smooth out whatever bulgey bits for whatever reason, that's their business. Fugly pants though.