Bourke harness (Australian)
Ronstan booties, because they work so I have tried nothing else.
Bourke sleeveless sailing longjohns because they are wonderful and a Ronstan spray jacket because it is way better than the Musto around the neck.

I always use a rash shirt (any make) and sometimes wear a poly prop T (Jeantex) if it is cold.

The rash shirt/spray jacket combo is great on a cold morning warm arvo day.
As it gets warmer you get rid of the spray jacket, then wet the arms of the rash shirt and then drop the top of the wetty.
Even on a hot day the wet rash shirt cools you quickly with wind chill (far more than if you are bare skiinned) if you are working hard.
In spring/autumn arvo into evening sailing it works in reverse.