Just to be forewarned: If you wear any Seahawks garb, prepare to be verbally and possibly physically abused. I went to the SNF game a few years back and was yelled at, spit on, and kicked in the back by unruly fans. I honestly never said a word, was just wearing my Hasselbeck jersey, but they were killing us, so the 'rub it in factor' was turned into overdrive.
I went out for concessions around the end of the 3rd quarter and a group of hooligans cornered me with F-bombs and started pushing and shoving. I noticed a uniformed security guard and went over to explain the situation and his exact response was: 'Welcome to Soldier Field'
In summary, it's not a very pleasant place. You can openly root for the Visiting team, but if you wear a Hawks jersey, be prepared for some serious backlash.