Two-tone tights?

I saw these f/w tights on style.com and I adore them!!! What are your opinions? Supposedly they have a slimming effect on your legs (always an added bonus!) They aren't available yet, but hopefully they will be soon.

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I would love to see if the tights are really going to have slimming effect. It's hard to tell when they are worn by size 0 models who have legs like sticks.

The lacey one though pricey are very pretty.