20 mile year round commute. Dress is casual and worn under my Joe Rocket Ballistic 2-piece, slighty oversized. I have worn it for the last 4 years and it has been great. I treat it w/ waterproof spray, with close attention to the seams. I wear lace up duty boots, unless rain is in the forecast and then I wear waterproof Sidi boots and change into casual shoes at work.
Storing your gear, on your bike will be problem, if it is wet, particularly when you put it on later. When the temp is around 100F, I slim down to a textile jacket, summer gloves and no over pants.
If you ATGATT:
Do you change at work and keep all your gear at your desk / locker?
Do you have your work cloths under your ridding gear and keep all your ridding gear on you bike?
If you do not ATGATT, Do you slim down and only wear helmet and jacket?