Sorry

I wear a 3/2 long suit right through winter and survive, I think one with a smooth surface is best as the water gets away a lot quicker. On the colder days I wear a shark skin under the wetsuit, no booties though as it make you look like a ninja and not a windsurfer

A hood makes a big difference as most of your body heat will be lost through your head, When you take a dip into could water in the middle of writer and you get a instant headache from the the cold you'll know what i'm talking about.
Forget about gloves, I've not come across a pair that work without giving you cramps, maybe the open palm ones might be the go.
A heated vest is also an option, battery or chemical powered offer an hour or so of heat to keep you going.
But yes you must sail through winter, you'll emerge into summer with TOW and be ready for next season.
Cheers jase.