The wax is there to help keep you from getting wet. Once you are soaked to the bone, you are done hunting in the cold. Filson double tin on top of a wool union suit is probably good to -50 Fahrenheit, if you stay moving.
I got soaked with sweat a few times in Filson, but, that is a different deal.
I don’t believe I have lived long enough to say I ever associated “sexy” with Filson, double tin, or, otherwise.

Best,
Ted