I do not watch either American Idol or Smash, so the name Katharine McPhee meant nothing to me until I saw her in a YouTube music video together with Chris Botti. She was not wearing pantyhose with her mini dress and high-heels, so I started searching Internet.
Like most celebrities she does not have such things as nylons in her wardrobe. Commercial shootings is a different story, though. I managed to find this photo of her wearing black back-seamed sheer pantyhose that was made for “Stuff” magazine. Did you notice the difference in the reinforced toe area on different photos? I wonder why they couldn’t found “sandal foot” pantyhose.
See Katharine McPhee on eBay (including that “Stuff” magazine with Katherine on the cover).