what wetsuit accessory(?) helps the most?

well, my dad and bro usually head to the beach for a boat show in mid-Janurary-ish, and they will probably go this year. I, have sadly never surfed past mid/late November, or any earlier than mid April. I didn't think that Janurary would be all that bad, but as of now the water temps are reading 40F (4-5 degrees celceius)
now, I've got a 4/3, but again, havent used it in really cold water, and im not sure if it'll keep me alive and enjoying it. Its a Jet Pilot 4/3, triple glued, double blindstich
its better for them to explain it
http://www.jetpilot.com/store/product_info.php/cPath/33_28/products_id/175?bfsess=63c2de84b2959f1136ad6636396c3298&options_value_id=
windchill is a mystery, VA is infamous (or famous?) for its very unpredictable weather, like a 20 degree day with 20 knot winds backed up with a 60 degree day with sunshine and no wind.
so what would be the best upgrade/accessory for a wetsuit to make it warmer? as in booties/hood/gloves/undergarments, etc?
thanks
now, I've got a 4/3, but again, havent used it in really cold water, and im not sure if it'll keep me alive and enjoying it. Its a Jet Pilot 4/3, triple glued, double blindstich
its better for them to explain it
http://www.jetpilot.com/store/product_info.php/cPath/33_28/products_id/175?bfsess=63c2de84b2959f1136ad6636396c3298&options_value_id=
windchill is a mystery, VA is infamous (or famous?) for its very unpredictable weather, like a 20 degree day with 20 knot winds backed up with a 60 degree day with sunshine and no wind.
so what would be the best upgrade/accessory for a wetsuit to make it warmer? as in booties/hood/gloves/undergarments, etc?
thanks