A lot of sheer garments have flesh-toned thin "sheaths" sewn into them to give the illusion of transparency without the possibility of "over exposure".
It's very commmon with lace, as well.
Yeah, I'd agree with that. But the entire women's fashion industry strikes me as a monumental scam, so I can see even expensive designers skimping on a lining.
Anyway, it's been really pleasant chatting with you all. I have to get back to work. Thanks!