Rode to work at 40 degrees this morning. Wore just the wool shirt, jeans, boots, gloves and tuque. I was starting to feel hot by the time I got to work (40 minutes).
Looks like it will be 55-60 on my way back, so I'll skip the gloves and tuque.
I agree you don't need special/expensive clothing. My wool shirt cost $25 and I can wear it to work.