I'm home for Spring Break and just paddled out today at Moses Field 2 on LI. Wore a 3/2 with an old 4/3 over it just to get me by, with 5mm boots, gloves and hood. Wasn't too bad! Definitely investing in a 5/4 for next winter though.
Wetsuits are so advanced now that it isn't bad at all. 50 years ago, getting in that water must have been insane
Wetsuits have advanced quite a bit over the years. As young teenagers, my buddies, brother, and I would cobble together our wetsuits from hand-me-downs, used stuff we bought from others, and miss-match pickings from grab bag sale items at dive and surf shops in Redondo Beach. What little money I had was from doing yard work or cleaning pools. The stuff really didn't fit well; and if we had two left gloves, we'd turn one inside out to fit the other hand. The the tops zipped up and had beaver tails. This was So Calif in the early 70s. We didn't surf then but went skin diving off Palos Verdes where we lived at the time, or out off Catalina. Good times. Loved that abalone.
I think you'll want a 543. You are not going to last long in 4-3. If you do go, watch for the horizon getting blurry. That's you in a vibratory shiver, by which time you have like 15 minutes before important enzymes that keep your brain operating begin to denature and malfunction, and you become really disoriented or unconscious. Then do the math. Actually, don't bother. Simple math is pretty much out of your grasp at that moment. OK I am exaggerating for humor, but not much. I used to paddle out in OCMD in February in a 3-2. It was stupid, and I swear I really did have some close calls. Put on a layer of capilene under the suit. Synthetic long john bottoms and tops. That does help a bit. Godspeed.