Before I bought my Drysuit this is what I would wear during the winter paddling season,
feet- neoprene socks and the neoprene boots
Body- non-cotton underwear , farmer John suit, Kokatat Hydros tempess pants with gaskets at ankle
Upper Body base layer- polyester/ spandex long sleeve shirt , then the farmer John, then another layer say a polyester and wool shirt.
Outer layer would be a Kotatat Dry top, (gaskets on wrists and neck , with a zelcro waist band
I wore gloves , some people hate wearing them
as for headwear, depending on the sea conditions ( and if I was planning on doing any rolling) I would either wear a simple paddling cap or a full paddling hood
even with all this, you may still get wet depending on the amount of time in the water ( when my rolls did fail, I was always out of the water within seconds and managed to stay dry for the most part)
One suggestion, if you add up the price of everything I have listed here and compared it to the price of drysuit you may just want to spend the extra bit of money and get one. ( you will eventually get one, it is just a matter of time
For further reading check out www.westcoastpaddler.com
as there is plenty of info there.
they even have a section with gear for sale.