My clothing layout is similar to Alan Romania's - I'm often in my car, and find myself underdressed from time to time. In car I keep a pair of Mountain Hardwear zip off pants, a long sleeved thermal shirt, and a Marmot Precip Jacket (keep an eye out for annual clearance sales of last year's models, I picked up a family sized volume of Precips for $25 ea). And socks and an old pair of boots. Every BoB gets a wool or thermal watch cap, and work gloves etc. For winter I add a heavier duty rain gear top and bottom, wool sweater, rubber boots - suitable for standing in the rain for hours or filling sandbags, then getting hosed down after. And since spring I've kept a bag with reflective rain gear in it, top and bottom, as I've stood around more near enough traffic or besides rivers and would want to be seen, hopefully. Just prepare for your environment, the rest takes care of itself.