Ironic, however, that we still wear "full suit" while sailing... but only for sun protection, not warmth.
Don't you have any windchill overthere on your latitude???
I remember sailing days in the south of France with airtemperatures above 30 Celcius and people could still suffer hypothermia.
Because the cold sea water on their skin was evaporated by a hot land-wind in a flash.
Taking all their body-warmth away.