I have answered the eternal question. Can you mix patterns for a job interview? The answer is an unequivocal "Yes!".
I wore the outfit below to a job interview. I didn't want to wear my most fashion forward outfit, even though it was a second interview with someone I knew. Now granted the first picture is a bit "Where's Waldo?" when it comes to finding the mix. Hint: I'm wearing a patterned camisole. You have acknowledge that it's at least more adventurous than a black suit. Ooh! What about tri-tone shoes? Does that count as another pattern?
Jacket - Mossimo, Thrifted (Unblogged)
Tank - Old Navy
Skirt - Banana Republic
Heels - Kenneth Cole Reaction, TJ Maxx
I did an open jacket shot just to prove that there really was a patterned tank under that jacket.