Hi. I am considering a pair of Uggs from the Neiman Marcus site. However, I don't know which size to pick. I am a regular US size 7½, and I'd probably want the Uggs in a real US 7 because they are quite big. I have two pairs of Uggs already, and they are both W (women) size 6 -but that is the Australian size. Do you know if the sizes listed on the NM site is the US or Autralian size? Anyone with experience from buying them online at NM (or Zappos perhaps)?