I have a lightweight raincoat from J&G Cyclewear that meets most of my needs for foul weather commuting. In the winter, a layer or two underneath is all I need. But for this AM, when the air was wet and the mist was light, I just rode in my standard outfit... a mountain biking shirt from Nashbar and a pair of mesh shorts. Raincoat and workwear was in the trunkbag. As the weather gets cooler I'll add nylon shell pants and for the sub freezing commutes wool long undies from Duluth.