It is very hard for me to find a proper wetsuit since I am pretty tall and skinny. Therefore I decided to order from DiveSkin - Quality Neoprene Products as from the reviews read here, they seem to be very good. Here comes my problem, what is going to be warmer, a 3 mm open cell suit of 5 mm nylon one? Did anyone one have an experience before? Most of the time I dive in Poland where the temperature is 16-22 degrees C.