cor, never even heard of waterproof socks . . .
when it rains I wear a baseball cap as the peak keeps the rain out of my eyes - unless the weather is really bad and it is raining horizontally, in which case I find staying in with Billy Blanks boxercise video keeps me warm and dry and really works my buns.
definately wear a waterproof top if you can, I wouldn't recommend a fleece personally, but if you are comfortable in one then go for it.
last week I went out in my long trousers, which when wet grew about 5 inches over my trainers and gained about 5lbs each leg, so I have now got the calves of arnie, which complement my thighs of thunder. So I would say either shorts or clingy tights which finish at the ankle, like Paula in the nike ad in RW this month.
good luck