Olympia Phantom riding suit over business clothing. For shoes I wear a pair of Joe Rocket boots that work pretty well as business looking shoes, black leather with no really weird stuff on them. I have to wear boots anyways as doing something stupid a few years in the past permanently messed up my ankles; as such, wearing boots is not even arguable as a "reasonable accommodation."
I roll up the coat and put in a plastic bag in the side-case. It comes out looking okay. If it isn't raining I change out of the riding suit in t he parking lot. Otherwise I walk in and change out of it in the break room.
As a nation we still continue to enjoy a literally unprecedented prosperity; and it is probable that only reckless speculation and disregard of legitimate business methods on the part of the business world can materially mar this prosperity. -- Theodore Roosevelt, Sixth Annual Message, December 3, 1906