Since there's so much interest, I want to add...maybe a whole size too big. They literally fall off my feet when I take a step. Too long, too wide. Also too high in the instep, which may be a "high volume" bias, rather than a size issue.
Only one review on Zappos...she says she went down a half size and it wasn't enough.
I tried them on with my olive clothes, and it was a no go.