Actually, even my 2 bosses, who don't regularly bike to work, have a suit jacket hanging permanently on the inside of their office door, for sudden meetings with the Powers that Be. We call it the "snakkejakke", which means "talking jacket", as in "ah, I see you have the talking jacket on. Going somewhere?" ;-)
I'm lucky and have my own locker at work, containing everything except food 
That's another final tip, actually, keep a little food at work if you can. Riding home on an empty stomach because you got a late phone call is very uncomfortable, and can even be a bit dangerous in traffic.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett