My commute is about six miles each way. Up to 70-degrees or so I just wear my normal work clothes. For me that might mean chinos and turtlenecks or skirts/dresses with button up tops under cardigans or blazers. When it's cold, I add a scarf, coat, and gloves. If it is on the warmer end, sweaters or blazers go in the pannier. When it is warmer than 70ish, I wear a sweat wicking top and change into a work shirt at the office.

I also don't ride very fast, about 12 mph. The slow pace allows me to enjoy the view and avoid working up a sweat.