What are the rules about aerodynamic clothing etc....in skiing/cycling they wear speedsuits that are one piece lycra and also aerodynamic helmets...not sure if this could help but if they are talking .1knot or so as being the difference between a winning or losing time, perhaps so...even leg shaving?

I guess most of the person is covered from the wind by the sail but would there be any drag associated with the human form which could be eliminated?
This stuff could also help but imagine they are across all this technology already
http://www.surfstitch.com/product/nanotune-diy-board-tuning-kit-white