I agree with what everyone else has said (I did on-campus interviewing in freezing cold several years ago). Your JCrew suit and Express pants look great. I generally aimed for a mismatched suit look (i.e., black suit pants with a grey jacket on day 1, grey pants with a black jacket on day 2). I used a wool turtleneck in a strong color or a bright silk shirt under the jacket, depending on the weather (I think my collar was inside the jacket collar but I am not sure ).
Sheepskin insoles are a great idea (I bought Ugg insoles on Zappos last year). I use black booties as my main "interview/presentation" footwear in winter (mine are Clarks Dara III, which are weatherproof, whatever that means). I like wearing them with knee-high warm socks (much higher than the top of the booties), otherwise my socks gradually slide down, and the booties end up rubbing the skin raw.
I bought this tote recently for travel http://www.zappos.com/michael-.....south-tote (on sale at Nordstrom), and I think it might also work as laptop/document carrier.