These were a near miss on eBay last week:
Cacharel 'degrade' sheer pants (retail ~ $775) from eBay seller edropoff, one of my favourite online consignment boutiques. I stalk them relentlessly for unique pieces from seasons past. Auction-style listings tend to start around $20, which always gives me the tantalizing illusion of having a shot. Turns out my meager bids never had a chance with these translucent beauties, and now I'm stuck wearing my usual opaque trousers... like a sucker.