I read an interesting article in Practical Sailor in which they compared the benefits of a Drysuit vs Survival Suit for offshore sailors. The conclusion was that Drysuits, the kind used by divers, kite boarders and paddle boarders, are gaining in popularity for good reason. Do you have experience with either on board?

https://www.practical-sailor.com/blog/Drysuit-vs-Survival-Suit-for-Offshore-Sailing-11605-1.html?ET=practicalsailor:e38999:125771a:&st=email&s=p_Blog112918

Vice Commodore, OCC 

Hi Daria,
Agree, dive gear is big, heavy and a royal pain—until you get in the water. I carry my BC vest only for dealing with the possibility of a foul anchor or some other need to go deeper than my makeshift hookah allows.
I wish I could say that you have chosen an inexpensive present, but I am unable to do so. They are not a minor purchase, but, with some care, they will last a long time. Mine is an NRS Crux drysuit and it checks all the boxes for me. I found a Whites Thermal Fusion (one piece very thick fleece essentially) in a going-out-of-business dive shop that allows me to stay for long periods in very cold water. I love it but admit that it might be over-kill. Think fleece for tops and bottoms as undergarments as you want uncompressible thickness. Long underwear is generally too thin. Plan on extra weights as the thicker the undergarments, the more weight you will need to achieve neutral buoyancy and certainly more weight than wetsuits demand.
My best, Dick Stevenson, s/v Alchem