A well pressed pair of decent cargo khaki's is pretty classy for the business casual scene where I live. A good pair like Trailhikers from Cabela's takes a good press and looks really good with a polo or oxford style button down shirt.
Regardless, I'm in nearly the same boat on any given work day. Hence, I put together a mini kit in a Witz See-It-Safe. It's more compact than a pack of cigarettes and carries well (read unnoticeable) in the front pocket of any (except for skin tight) pants pockets...

As stated in an earlier thread, the one shown above was confiscated by my S.O. My current version has the basics of fire, first aid, water, signaling, direction finding, and cordage for shelter building...
M