I saw these in an ad for Chanel a few days ago and without looking I already found a similar and cheaper version online at Urban Outfitters here for $14. The difference is that the originals from the Winter 08/09 collection are opaque white and black and the UO version are sheer and black. I guess you could layer them over white tights? However, I'm sure someone is making a pair closer to the Chanel version, right?
These are the other pair that Chanel showed on the runway. UO has a knock-off pair for these too.
Photos: Chanel, Frances Tulk-Hart for The New York Times